I know where you are. Do the slig thing and then after completing the bat and boulder puzzle, sneak to the next screen. Crouch and arm the bomb on that screen and then run/roll to the right (I roll as I'm already in a crouched position). The slog will wake up and chase you and will arrive at the bomb when it blows up. All you have to do now is get the bell song and pull the lever to activate the flint lock.
Hope that helps
[Edit] You didn't mention the bomb by the way, is it there? It should be.