When they are stuck in the genesis cave and Kirk ask Spock if he's ready.
Doubly satisfying, Mann gets his just desserts then Cooper pulls off the impossible.
Yep. The whole soundtrack in the film is something else. Works so well.I don't know how you post that scene without mentioning the soundtrack. Those church organs are immense.
One where Praxis explodes and later when the Excelsior is racing to get to the Enterprise and Sulu tells them to fly her apart.
Also:
Dramatic Zoom to Kirks face - "Fire!"
Chang - "To be or not to be"
Sulu - "Target that explosion and fire"