That situation is tough! I'm assuming Human Torch and Invisible Woman were the last two standing?
Hmm, you definitely want to take Hulk out, because down to one life he's not worried about Invisible Woman's boosts. His next attack is likely to be a killer. So with Human Torch down to one life and
needing to kill now, it comes down to either a Supernova attempt that can catch Invisible Woman in the wake (and you need her to survive to take on Daredevil), or a 50% chance of killing Human Torch and wasting your turn to get an 80% chance of killing Hulk.
I sort of feel like the second one might be the better play, but if I'm down to one life Human Torch and I haven't used it yet, I'm going Supernova!