So... I suppose to start off, I've been doing some research on how to let players pass through a door but not allow bullets or projectiles pass through. Tried a few things including downloading this guys https://www.youtube.com/watch?v=6NZ-w8EuJ40 test map to see if it would work on TF2. Turns out, it doesn't. So could anyone give me some pointers on what to use/do to prevent bullets/projectiles/bombs/etc from passing though the area but allow players to pass?