Christopher is fine with surviving in high stress situations. If he complains about the cold, he's probably just sulking. He will also provide combat skills very very eagerly. Killing is really therapeutic. AND HE IS CHEERING FOR US GO TEAM GO LET'S BE FRIENDS LET'S GET THINGS DONE!!!!

He also has an interest in Finding The Initiative because he wants to complete this damn mission so they can right and properly get off the moon!! So he'll actually be trying to be helpful on that front in whatever way seems best.

Which, given his background, means getting down with the criminals.