1. Pick talent that reduces attack cost to 2 AP for first attack against enemy.
2. Position yourself next to an enemy you have not yet attacked
3. Remaining AP should be 2
Expected: Able to attack enemy next to you that you haven't attacked before this round.
Actual: Unable to attack.
Do note that with 3 AP, it is possible to attack such an enemy. 2 AP are used and 1 remains.