I think I found a bug.
If I use the chainsaw on the zippers, wake up/leave the area, and then come back, the zippers will be shut again and they won't open. Nothing happens when I use the chainsaw on them and the lantern does nothing either (other than Urotsuki's "holding the lantern in front" animation).
This is especially problematic if I have not gotten the Trombone effect before waking up, as I do not have another chance to get it. Help, please? Thanks in advance.