[He has to nod, because he understands what Kotomine means, it isn't a simple solution, but he still can't just accept that either.]

You'd give me one? [Hell, he didn't even know that was possible.] Wait, if you have those, can you use them on Servants? That would be really useful, more than anything I could do with it!

[He's already used one, but that was a one-off, he shouldn't have to ever use one again, it's just that Jekyll, or Hyde or whoever he was then, wasn't in his right mind.]