Using this command, you can set up an ambush in a room, which puts you into hiding. Then, if a target walks into the room you can 'ambush whatever'. You then leap out on the target, catching them by surprise and potentially dealing devestating amounts of damage. If a target can see you in hiding then you will not be able to ambush them (they know you're there). The best weapons for ambushing are Thieves' Daggers