[I dunno man he's got a lot of practice with the ominous loom.

Vader himself does not sign, but the expressions are enough to get the general mood of the jab across. So instead he reaches up his hand and twitches his fingers, a touch of Force to add pressure around his throat.]

I assume, as you are acknowledging me, that you are not deaf. Therefore I will tell you to find a better answer, or the Empire will discover if you have the power to scream.