still on learning curve here...but was playing on"frozen" last night, on the level where the labs are and I got wounded from someone unseen by me...in a corridor you haven`t got too many places to be watching ...and later when I was doing a bit of free ghosting..great way to learn maps....I returned to the scene of the mystery and I saw a guy in a room that joined the corridor where I`d been shot it was seperated by a metal(?) door and as I watched him he fired straight through the door before he opened it and went into the corridor...which is obviously how he or someone had managed to wound me without me knowing he was even near me (no door was open when I was shot)....am I right to assume this? metal(?) doors do allow shots through? doesn`t seem right if its so...you could just place a SAW in any room leading onto a bottleneck corridor and blast away every so often and it would be a real sod to try and take out.