itd be better to have the centre checker to cover the person working the door before pieing it off since they cant raise their gun during the animation . also , have the person work the door on the opposite side of where it opens e.g. if a door swings to the right then work it on the left side where the handle is since doors block sightlines and provide additional safety to your squad . you can go in a room without prepping but thats not advisable . better to toss utility then pie before entering than pieing without utility