"Katara, I can take plenty of damage! Do not concern yourself with protecting me!" She should have expected as much from Katara. She made her way around the dome, aiming another attack at the mutated creature.

If she could disable it, then when it became this Steve person again, he might be in pain, but he would be alive and he would have done less damage. If she could even manage that. His blood was... off and his strength was clearly intense.