Well, poor Lt. Galway. And in a mark of how edifying this thread can be, I never really thought about what an abject jerk Chekov was in that scene, with five of his shipmates dying. In fact, given that TDY is one of the relatively few Sulu + Chekov appearances in S2 (and one of the very, very few in S2 where the two exchange any dialogue), they missed a real opportunity there for some nice character interaction and development. Instead of having Sulu say, "You'll live" with a smile, he could have said something like, "You know, Pavel**, the captain, Spock and the others may be dying. Don't complain so much."
**I'm not sure if Chekov's first name was established by TDY or not, but I think it was.