Clementine doesn't think he's got anything to apologise for, he's alive and that's enough. None of them can be prepared for what they're going to find in here from the start, the Capitol makes it that way, wants them to be surprised and taken off-guard so they die in the most entertaining ways possible. It's not Nick's fault that he didn't expect to get electrocuted and then jumped on by some horrible muttation.

"I'm glad you're alive." she says, adding her own voice to what Luke said. "We can probably stay here a little longer if you need to."

A little longer but not too long. They have no food, no water and Clementine is willing to bet those resources in the arena are probably finite. If they don't hurry up and find some the other Tributes might take them first and going out that way sounds worse than any of her other deaths.

It's not a death she wants for her friends, either.