Sometimes, eating a quantum mechanic corpse and causing your velocity to become uncertain can give you temporary very fast speed instead of toggling intrinsic speed. (In variants that implement a player-side slow intrinsic, it should also be capable of giving a temporary quantity of that.)

If you have teleport control, quantum mechanics’ attacks toggle your speed instead of giving you a free controlled teleport.

Quantum mechanics’ hits toggle your speed instead of teleporting you if you have teleport control. (You already know your position, so your velocity must become uncertain.)