"Well keep your gun to yourself in here, this is a zero tolerance zone." Guppy says.

He'd rather not like to have to stun Mycroft. For one thing, he suspects he'd lose.

He gets the bone fuser out and sets the correct distance.

"All right, keep nice and still for me - keep your breathing slow and controlled so I can move with you. This will be a bit uncomfortable but it shouldn't hurt, so let me know if it does."