Originally Posted by Koquillion:
“You would survive a shin kicking contest, but your post match broken legs wouldn't perturb you?”
Well, 10 fell out of that spaceship, through a domed glass roof without any apparent injury, so why would 7 worry about a different fall from a great height. That's my point.
I'm sure it's not the strongest example of inconsistency, but it's the best I could come up with at short notice.

There must be plenty of "He could do that then, so why didn't he do that here?" moments.
These special abilities come and go at the whim of the writers, just like fixed points, changeability of history or non-changeability of history. There's no internal logic or consistency, which, I admit, is problem for DW in many other areas too.