Black Plague: a stuck door

[Caterpillar]

I have a similar problem in Black Plague. In machine room when I have to cut the arm of the cadavre, If I keep myself near the door, I try to cut the arm and then the cadavre falls down, the door won't close behind me.
It will close only if I walk through the room. I am able to leave the sector! You must fix that bug.

Which is the button to take screenshots?