So I'm at a part in an AP where the party comes to a room with Kytons (the original chain-devil evangelist types) and the ceiling is covered with chains. The Kyton's Dancing Chains supernatural ability allows it to control up to 4 chains within 20 feet so basically every square in the room is one they can attack into. The Dancing Chains ability states:
A kyton can control up to four chains within 20 feet as a standard action, making the chains dance or move as it wishes. In addition, a kyton can increase these chains' length by up to 15 feet and cause them to sprout razor-edged barbs. These chains attack as effectively as the kyton itself. If a chain is in another creature's possession, the creature can attempt a DC 15 Will save to break the kyton's power over that chain. If the save is successful, the kyton cannot attempt to control that particular chain again for 24 hours or until the chain leaves the creature's possession. A kyton can climb chains it controls at its normal speed without making Climb checks. The save DC is Charisma-based.
So my question is does that mean the kytons threaten every square within 20 feet if the ceiling within 20 feet is covered in chains? Can they make AoOs with controlled chains?
Secondly, when they control chains, is it feasible they can perform combat maneuvers (grapple, trip etc) with those chains and be out of range to even trigger an AoO from the target? Granted I suppose the chain itself may be subject to an AoO.