I messed around in custom with the survior, 3 of my buddies and I tried to kill each other in various ways on Valhalla in all the vehicles on the map, we got mixed results to say the least, sometimes 1/2 shields, sometimes no shields, sometimes you die instantly
never had someone pop out with full shields, whatever
it seems that its very finicky on when and how it works, Im not saying its a good thing.
Im just saying that throwing a blanket on the whole game is a bit weird, and tbh, its not a perk that will change the whole meta game, people will get their fill of it
not defending its existence, just don't care enough for it to "ruin" the rest of my Halo 4 playtime, I killed a couple guys mid-air after sticking their mongoose, its kinda silly and fun.