I mean, I'd like to *think* writers would be familiar with a character's history before they begin portraying them... But that certainly doesn't always seem to be the case.
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"I am tired of Earth. These people.
I am tired of being caught in the tangle of their lives."
whoa, whoa, whoa there hold on a minute. It was said that he was whisked away because the serpent didn't want to RISK his death. That doesn't mean that he knew for sure if cain would die. In the middle of a war, a commander can recall his soldiers and retreat because he doesn't want to risk losing them. It doesn't mean that there's an absolute certainty that they'll die. Just wanted to point that out.
that doesn't necessarily mean that the explosion would have killed him. It could mean that the explosion would soften him up enough for colossus to finish the job. Also, do we know how powerful piotr was when he fought kuurth? I'm pretty sure that colossus was far more powerful than the average juggernaut.