Interesting pull during Fractal today. Was this wipe my fault? I made a short clip of about 1 minute. I think they blamed me for it.
https://www.youtube.com/watch?v=FbxO3QDr-Hg
I've only ever been in one group that attempted something like it before, but that one turned out alright. I'm not sure sure how I could have reasonably healed everyone in this situation though. I purposely tried to leave my healing as late as possible because I didn't want to agro the new enemies but I was forced to anyway (luckily tank took control somewhat quickly and for a bit it looked okay).
I had no idea he was gonna pull this big so I was caught off guard a bit. I probably could have used benediction and Asylum, but I wanted to swiftcast a Medica II quickly... //shrug.
During a pull, if a Tank starts taking enough damage that they go below around 80-70% before stopping, re-up Stone Skin. It's hate generation is very low and any decent tank will steal it right back if you somehow manage to pull threat off a mob. If they dip to anywhere below 60% and are still moving, you need to to give some sort of heal. It's best to throw out that heal before they grab next mobs and have current mobs on aggro - this won't steal aggro (usually) so long as tank hit all the mobs with something (Flash, Shield Lob, Tomahawk, etc). The instant they stop, heal them up and get regen on them. You then must decide if you're going to go hard on DPS or if you need to focus more on healing with minimal DPS support. Indecision in the early part of when the tank stops and it's time to fight is likely to end up costing you dearly, since it's the time where it's most important as a healer that you be casting stuff and not being idle. When there are fewer mobs left, you can have the luxury of being a bit more lax.
So in this instance, you probably should have re-upped stone skin earlier on in the pull, and thrown out at least one cure as he got close to stopping. However, I can't stress enough that the instant the tank popped Hallowed Ground, you needed to stop healing them.
As for the tank, it's odd to me he did not pop a single CD until he was near death on that big pull and then that CD was rampart ... So maybe they weren't expecting to be so low on HP? If it was planned, there was no reason to burn rampart. Their HG pop seemed more like a reaction to "oh shit, about to die" than planned out.
When it was clear the tank was safe for the time being, and you saw the party had lower HP and was still taking damage, you needed to switch over to healing up the party.
Instead, your Cure II on a tank in HG is interrupted, and then you opt to cast it again on them. This wasn't necessary. You then throw out another Cure II on the tank to top them off. Really unnecessary.
At this point, both you and the SMN are below 50% HP. The SMN was still taking damage, and they take another hit to bring them into the 2K HP range. You then overheal the tank with another Cure II. You should at least have had that Cure II go to the SMN. Not sure if it was tunnel vision maybe or panic, but you throw out 3 straight Cure II casts to a tank that's invincible while party members are taking damage.
You then burn Swiftcast + Medica II, but it's too late and the SMN dies. If you had done medica II when the tank popped HG and dropped asylum, you would have made things a bit easier on yourself here. You should have at least been healing up the SMN and yourself while the tank was safe.
Despite burning your Swiftcast and being down a dps, you could have possibly recovered if you popped Presence of Mind and tried to raise the SMN. You could have given yourself some breathing room if you had HoTs up on the tank and had dropped asylum, and you also had Benediction up -- I would have gambled on a raise and spamming that Ben button on the tank during the cast. Basically hoping the tank can stay alive long enough so you could get up SMN and then instantly top them off with Ben and go back into healing the tank normally. The tank could have done you some favors by popping every other CD they had left. The pop the one that blocks a single physical attack, but no Sentinel, no Convalescence, no Bloodbath, no Foresight, no Awareness, no Bulwark.
After topping yourself off, which wasn't necessary, you switch to healing the tank as they're getting slammed by all the mobs.
As a WHM, you're taught "spam Cure II" is bad since you want to Cure I as much to proc freecure, but if the tank is losing HP faster than your Cure I casts can keep them up, you need to switch to Cure II spam. Your MP was fine at that point, so you should have at least been Cure II spamming....
But with a DPS down and the mobs not even all close to being dead, the moment your SMN died and you didn't have swiftcast anymore, it was GG. You would not have been able to keep up the heals on the tank as you would have either burned through your MP before the adds all died or even Cure II spam wouldn't have been enough to keep the tank up as they were getting pummeled by so many mobs.
But one thing I will point out that did you no favors, is you're having pretty decent latency issues. It certainly contributed to the wipe.
So what I would have done from the start:
Given a stoneskin to the tank during the pull between groups of mobs. When the tank stopped, dropped asylum and put regen on the tank. If the tank was planning to pop HG, I would have gone Cleric Stance - Swift Aero III -> Assize -> PoM -> Holy Spam until HG wore off and tank needed heals at some point. Get out of cleric stance and resume healing tank. During my DPS part, I likely would have taken hate, so at some point after I had hate I would have used Shroud, probably when I was done DPSing and tank's HG was about to wear off. From there, I would have gone back and forth between DPSing if I could and healing up MT. If any DPS were taking damage at that point, throw them Tetra + Regen and spot heal them as needed, though the tank should really be holding hate or stealing it back to get the mob off that DPS.
If the tank wasn't going to pop HG, I would have focused on healing them while trying to weave in an Aero III or Holy (for dps/stun) every now and then.