An emergency quench of the magnet takes about 1-2 minutes.

There isn’t a way to instantly turn it off.

Does that energy basically turn into heat because the superconductors start to have electrical resistance?

If so, I'm curious if that heat causes additional damage to the machine, necessitating a refurbishing or at least some parts replacement.

I believe all that heat goes into boiling off the helium keeping it cool.

All the more reason to push the button immediately.

Isn’t 2 minutes enough?

Nope. Because the crushing action literally rendered his neck beyond surgical repair.