I was looking through the books and have come across a potentially interesting combination. If you were a Polearm Master, more for the bonus's but also to shorten your grip, and if you had lunge, you could be at 15 ft reach in a given round if you equipped a weapon like a Longspear. If you had Combat Reflexes, you could also make a fairly high number of AoO every round.
Lets say you have Combat Patrol and you set up a patrol on your turn. An enemy charges you on their turn. Could you accept the AoO when they enter the 10 ft reach, move 5 feet away from them with Combat Patrol, and then attack them with the attack while they are at the 15 ft mark?
Taking this a step further: if this is possible would the enemy keep charging because he hasn't hit you yet and if he does, can you keep back peddling and attack as long as you have movement/room/attacks/enemy has movement to do so?
This opens up some interesting enemies that could surprise players in my campaign if it's a valid composition.
My apologies if this has been posted before but I haven't found anything with the wording I've used.