The enemy was a master, there was no doubt about that.
If they stayed, they were as good as dead, this too was without question.
But for Paul, being as good as dead was just that, death, and death had never been an issue worth overthinking for him.
If death had value, then it was worth dying for.
What constituted a death with value? Everyone would have a different answer to this question.
For Paul, as long as Brian didn't die, then anyone else's death would suffice, including his own. If he could trade his life for Brian's, then his death would have value.
However, Brian was now immobile, lacking the ability to move on his own, so it was necessary for Kate and Xiao Ran to help Brian escape, which made Paul quite willing to stay behind and cover for him, giving Brian the chance to get away and survive.
Xiao Ran had the same plan in mind.