Hold on a moment. River knew that look all too well and that drew her in a bit more as she approaches. "Unless of course the time vortex reroutes the call to someone else. Like, say his wife who was in prison at the time."

However, considering the woman mentioned him and seemed to know him as intimately as River did...There should really only be one other being that did. "Then again, if a certain TARDIS is calling herself, he might not hear it right away. He never did like staying in place after all. Even when she was parked."