[ Fine, fine. He was trying for a tag-team let's split up, divide and conquer approach, but as much as what lurks beneath the water tempts the Doctor, it would surely tempt Vanessa Ives in turn. He knows that much at least. He surrounds himself with people, after all, who find a thrill in the adventure and the unknown. There's no hanging back for them. ]

Should I tie my hair back?

[ A playful smirk, because he must. And, of course, the necessary accessories are removed. ]

Bet I can beat you down there! I'll give you a running headstart, on the count of three — one...two... [ And he's a nasty cheater who's already diving into the water as if this were a leisurely evening swim. ]