After a couple of host migrations, someone from the other team could not be killed.
He even survived the chopper blades.

Eventually, while almost everyone had given up, he did die.

FFG RAOH (the invincible guy) was in our party, and he rejoined our session after a failed host migration. He didn't want to kill anyone while he was invincible.

He even survived a thrown pole from me that would normally kill a nanosuit!