So, i was just fighting the Hydra on Dhaal as a Kineticist. I used Energy Leech to freeze her, then Mind Crush to stun and break the ice... inflicting exactly a combined 150 damage, reducing her to exactly 0 HP... This did not end the fight however. i got two turns of "you've knocked the resistance out of the Hydra", wailing on her corpse with my weapons and hitting for no damage but the fight not ending, and then, i guess after the stun from Mind Crush wore off, her Heal proccing and bringing her back to life.