Scotty was passed out, McCoy wasn't guarding the door he was treating Scotty who was suffering from radiation poisoning.
I know McCoy is treating people in engineering. But he also stopped Spock from going in the chamber. Is that arguable? Spock has to knock him out to get by.
As for no one else caring to try it, Its ludicrous to suggest that. Nobody on the ship could have survived the amount of radiation being released.
So what? Spock didn't survive it either. The fact is the ship is going to be destroyed and no one in engineering made an attempt. Who cares if they didn't survive. What part of they were all going to die anyway do you not understand?
Apart from Scotty, Spock was maybe the only person on board with extensive knowledge about how to fix the problem (we've seen Spock's technical expertise and he is portrayed as a "polymath" through TOS)
That's your speculation. I can also speculate that any cadet who's allowed to work in an engineering room can flip the switch in the glowy tube that turns the engines back on.
Nimoy didn't necassarily want out, he just wanted to do something meaningful in the movie.
Have you ever heard of "I Am Not Spock"? Did you know Spock was not going to be in Phase II? He didn't want to do Trek anymore. He very vocally wanted out. It wasn't until the end that he realized he was screwing himself so they added the extra poop at the end. Then he used it as a bargaining chip to direct the next movie. He's said as much.
First things first, they had no idea how to stop the Genesis torpedo. Kirk was doing the best he could to get as far away as possible.
No, he was sitting in his chair barking orders to a dead com link. It should have been Kirk to run down to engineering and see what the hell ws going on instead of sitting on his thumbs. First the guy won't raise shields in an obviously hostile situation that even a cadet knew was going to end up in a shooting match, and now he won't take charge in a fatal situation. He need's Spock to be the hero. This is a lot like TMP where he's also basically so incompetent that Decker needs to step up and be the hero. Kirk was frozen.
McCoy stopped Spock out of concern as a doctor and a friend and since he was down in Engineering, he wasn't exactly sure of how serious the situation was.
Really? The captain screaming like a pussy over the intercom that he needs warp speed in one minute or we're all dead didn't get the point across. So much more reason why Kirk should have gone down to engineering. "Because nothing is more important than my ship!"
Scotty's recovering could have been pure shock at noticing Spock inside the reactor room, but then again it could just be a result of whatever treatment McCoy gave him, taking effect.
Scotty couldn't have done anything to stop Spock, except shout at him and demand he gets out of there, if he went in he'd be exposing himself to fatal amounts of radiation (and Spock probably sealed the door anyway).
Tons of speculation about a poorly written scene in which someone just happens to wake up when their own personal danger in gone. It's like Anakin's mother just happening to die as soon as he gets there.
People need to understand that, dramatically, when you need to make this many rationalizations about a scene then the scene didn't work. One or two of these would be ok, but all of them strain credibility too much. And then this is added to all the other sloppy stuff elsewhere in the movie - like DS9Sega's point about McCoy not checking for Chekov's body creatures.