Hi, first of all, thanks for playing!
I haven't experienced a bug with the armor sprite, but I'll take a look at it.
Did you find that you can disable the smoke with switches dotted around the station?
The Smoke monster is totally subject to balancing so the more feedback I get the better. It needs to be deadly, but there has to be options to get it off your back if you're trapped with it.
I did allow it to be "killed" if the player wants to unload all their ammo into it, although it will resurrect after a while. (The sprite shouldn't remain so that's something I can fix, thankyou.)