So that's a no, then; best to keep those memories to himself. Can't be giving away spoilers, after all. Or can he? Fixed point in time... hm. Things get strange around time anomalies, and Jack now knows he's the mother of all time anomalies. Plus the Doctor is a Time Lord, and you know what they're like. Best to play it safe anyway. At least the Doctor isn't running away from him this time.

So he chuckles, raising his eyebrows at the Doctor. "Time windows, huh? Tricky business. I'd rather travel by vortex manipulator, myself. Or the TARDIS, of course." He glances around casually. "Where is she, anyway?"