Same. I killed the tyrant then when I was about to die I ran away and abandoned my teammates, They respawned once I made it to safety.
Here is the trap I fell for that scared the crap out of me...Tyrant spoilers in nocturnia:
First I was walking along and then a damn flower turned into a monster (wasn't on the radar). So I jumped off the cliff into the water to escape it. When I finally out-swam it -- I was here:
https://d3esbfg30x759i.cloudfront.net/ss/WVW69ipJqWkePaNtoe
I was like, ohh cool. Some sort of ancient structure. Let me see if I can go inside. I swam towards it. Then when I touched it, the Uncontrollable track kicks in and that thing freaking stood up and revealed itself to be a freaking Tyrant! IT SCARED THE CRAP OUT OF ME! I tried to swim away as quickly as I could but it one shot my entire party.