

Given what happened shortly afterwards, it was probably a good call. However, he possibly realized that sorting out payment with the IMC over Coopers' life would have taken so long that BT would have likely recovered by the time payment had been agreed upon, so didn't even attempt to, and instead opted to leave. If he really wanted Cooper dead (which he logically would), he could have negotiated a new contract there-and-then to kill him. All his talk of "If you wanted me to kill him, it should have been in my contract" may have also been him being savvy, too.For Blisk, a man who's explicitly Only in It for the Money, Cooper just did him a huge favour. Considering the high stakes of the Typhon operation, the contract was probably worth a lot of money, money he had just received moments earlier. Not just that, by killing the rest of the Apex Predators Cooper has ensured that Blisk is the sole recipient of their paycheck from Marder and the IMC for delivering the Ark core, instead of splitting it six ways had the rest of the team survived.As such, how exactly does killing Cooper now, when he can't fight back, prove that Blisk is better than him? It's not a case of not killing him because he has no reason to (fiscally or otherwise), but a case of he won't kill Cooper in anything less than a fair fight, in order to prove that he's better than him. I kill you, I'm better", which implies that killing another person is a show of superiority to him.

Blisk believes "You kill me, you're better. Cooper's wiped out most of his unit more-or-less single-handedly, so he's a Worthy Opponent. Why doesn't Blisk finish off Cooper after the Fold weapon knocks out BT with Cooper still inside, helpless? It's part of his philosophy.
