If he stayed he would be a goner.Are we reading the same manga?
I recall Sasuke failed to capture Killer Bee. Then Killer Bee used the situation to get some vacay.
Killer Bee could had came back and blasted Sasuke but he used the attack for his own advantage.
Yeah I must have dreamed the part where he asked Sakura to finish her off.
However, lord Sasuke was prob giving her a mercy killing.