Yes, yes, yes we did, but we need to go back! There's no other library that has that sort of information, is there?! Ergo, we have to go there!

[ he's nodding his head wildly, pacing around the TARDIS impatiently, thoughts racing faster than he can make them into spoken words. ]

There's got to be a way to come back but without me being vivisected. Come on Professor, think! You have pull and influence in this place, do you not!? Then help me think of a way to get myself in there without ending up like a specimen in a jar! Think!