Heidegger performs what he says: withdrawal also, at the level of his discourse, his text, withdraws (from contamination). But things don't stop with just this. For what this allows us to ask is the following: What could it mean to think withdrawal otherwise than as protection? This is what Derrida is getting at, this is what he thinks Heidegger falls a little short of doing. And it's understandable, for to think withdrawal otherwise than as protection against technology would be to think withdrawal as a function of technology, as permeated by the technical. This would in turn make the phenomenon itself--which is self-veiling or withdrawing--technical. A technical phenomenon: this is what it is impossible for Heidegger, and incumbent upon Derrida, to think.