Hart, after receiving his vision of the dying man's life and realising how much he owed Bowler, ran to find Bowler's (or in this case Bowler's broken form.) It was Hart carried brought Bowler to the exit so that Bowler could leave.
As for the Beast's plan, it was simply to torment Hart once Bowler was no longer around to be a support mechanism, and to always let Hart - as Hart now knew how to get out - think he was going to escape and then always prevent him doing so at the last minute, in order to screw with him in the worst way possible (The Beast says all this to Bowler.)
P.S. but put a spoiler warning in that title! ;-)