How we cite our quotes: All quotations are from Star Trek III: The Search for Spock.
Quote #7
KIRK: My God, Bones, what have I done?
MCCOY: What you had to do. What you always do. Turn death into a fighting chance to live.
Another consequence of Kirk's choices is the destruction of his beloved Enterprise. While Kirk looks on in horror at what his actions have wrought, McCoy reminds him of another, more beneficial, consequence: They all got to live that much longer.
Quote #8
KIRK: You fool, look around you! The planet's destroying itself!
KRUGE: Yes, exhilarating, isn't it?
KIRK: If we don't help each other, we'll die here.
KRUGE: Perfect. Then that's the way it shall be.
Again, Kruge's decision is to get Genesis no matter the cost and this time that might include his own death. Got to give him credit: this Klingon knows what he wants.
Quote #9
MCCOY: Spock, for God sakes, talk to me. You stuck this damn thing in my head, remember? Remember? Now tell me what to do with it. Help me. [McCoy looks concerned.] I'm gonna tell you something that I never thought I'd ever hear myself say. But it seems I've missed you, and I don't know if I could stand to lose you again.
We always wondered why Spock chose to put his katra in McCoy when he had a perfectly good, unconscious Scotty nearby. In this scene, we see why. He knew McCoy would choose to do what was necessary to ensure his katra got back safety. They may argue all the time, but they're true spacebros in the end.