User blog comment:Xilinoc/Ch. 565 (Mangapanda is run by lazy barnacles)/@comment-24279073-20140123070855/@comment-5398287-20140123221141

Uryu is smart, but he may have wanted revenge so badly that he didn't think that far ahead. Can't blame him, to be honest.

On the other hand, if it had been Urahara, when Haschwalth confronted him and revealed he is now bound to Yhwach, Urahara would've revealed he had turned the tables with Kido/another Benihime ability/his Einstein^2 to make Yhwach bound to him.

And then he would've blown up all of Silbern with his awesomeness.