Spoiler 
1: New item, Remote Sentry, can be earned with killstreaks or bought with say funcs (not with f1-f4).
2. The player gets it and places it, it occupies ONE tile, can be placed in floor only.
3. New item: Player receives it immediately after placing the turret.
4. When the player hides and uses the Turret Controller, he is teleported to the turret position, but the skin is covered by the turret; He is equipped with M249 or any other turret-like gun.
5. The player (in this case, the turret) has its own health and if the turret is hit the player takes no damage, but the turret does. When the turret health is 0 it explodes causing about 20 damage (or not).
6. When the player is controlling the turret, the early player position is filled with a sprite: a player image holding the controller. If that image is hit, THEn the player will take damage.
7. When the turret explodes the player is teleported back to the early position, and loses the controller; the representative sprite vanishes.