Also the NPC had to stop several times to defuse bombs or whatever, and instead of just overriding their normal movement mechanics to go straight there when they get close enough, they usually miss the bomb and have to swim in a big circle and try to line back up, but that doesn't work very well either, so after they spend a good ten seconds trying in vain, they just suddenly snap to where they're supposed to be. And no, the timer doesn't stop for this, nor your breath meter, nor their breath meter, nor can you abort the process to force them to go get air.
Arguing on CE be all like:
https://youtu.be/JpRKrs67lOs?si=kPGA2RCKVHTdbVrJ