Flexible Melee Attack
Trigger: Any even
The attacker performs some sort of dirty move, say tossing dirt in the eyes, a sudden headbutt, or tripping the opponent that allows them to immediately pop free of their target.
Adventurer Feat: Till the end of the attacker's next turn, the target is at a -4 to defenses against them.
Champion Feat: Should the target reengage before the attacker's next turn, the attacker gets to immediately make an opportunity attack on them.
I don't have a good Epic Feat yet, as I only thought of this last night for a player.