After damaging Jack Baker enough in your encounter in the morgue, he will walk away from you and pick up a chainsaw scissor weapon. You can walk around the room to observe his attack patterns, but all you have to do is crouch under one of his attacks.
Here is a video guide with English commentary!
Here is a playlist of guides for this game!
https://www.youtube.com/playlist?list=PL-HeW6XkKdUKUtj7CV_kW...