There's a very fine line between undercooked, perfectly cooked and over cooked crab.
you have a minute window. A full 16cm buck I'll cook for 10m30s. Then straight into ice slurry. Your correct in a sense noel, once it's 30 seconds over cooked it may as we'll be 30 minutes over done, there is minimal difference as the flesh is sooo delicate to begin with.
once you've had it perfect, you'll know what I mean