OK, so the throwing knife would activate kind of like a pellet gun where you hold the knife and when you let go of the trigger while not throwing it, it would spin in the air above your hand, but if you spin it, then throw it it will auto target the nearest player in its range and it would slowly drain cotton of players if the player did not take it out after it hit them
Another idea I had is a sewing needle that you can use like as a grappler, but with players and you can pull the players towards you