Jack rocked backwards with the push, and just about managed not to fall on his arse. He pushed up to his feet instead, and moved to lean against the railing, out of the way of John's pacing.
"I really don't know much about regeneration," he admitted, looking at Romana. "But that seems to make sense." He added, "The Doctor showed me which room he's in when we passed. The Master seemed to be still in there."