Eventually PC and Dot-C are in Batty's house, but PC just can't bring himself to kill Batty. Dot-C snatches the laser pencil from PC and blasts Batty.
Dot-C then shape shifts to become the Quirm-bot, having unbeknown to PC, already destroyed the original Dot-C.
Parallel World
(with more twists and turns than a twisty-turny thing. And a thousand elephants!)
So what do you reckon?