It doesn't really matter that it teleports stuff randomly, given you have all the time in the world to wait for it to grab what you need. As Pent's screenshot shows that allows you to also drain the shops of all their money so that's basically a more complex library exploit.

there are two of them, odds are one of them has a wish.

Instead of applying a "super slow" to them, we could instead make use of the game's beartrap/sticky tile code that traps one of the enemy's limbs and one of your free arms to hold them (and you) in place. This also makes the limb you grabbed and your arm unusable.

This works doubly well because the code for beartraps supports breaking out of them, just as an enemy could break free from your grasp and leg it.
Or perhaps if poweful/fast enough, just run off with your arm still attached...

we could instead make use of the game's beartrap/sticky tile code

beartrap

I like this idea a lot, the problem here is that you could abuse the hell out of that while the amulet still exists. For example, you could assure victory in the sumo arena, or even beat Petrus while under its effects, sit on the throne and become the world's shortest reigning high priest.

Of course in most situations the most that's going to happen is you're going to sit there while whatever nasty monster came along lops all your limbs off and leaves you to wait for the amulet to expire while being nothing more than a bloody mess on the floor. Even if we make the amulet prevent limb loss, they'd still become disabled from having no HP, and if that includes your head you'd be completely ass out of offensive options.