Attack-and-run is actually one of the worst strategies for any form of melee fighter. It's so weak that you should actively hope that he pulls it. If you have anything near a well-balanced party you can take him down with ranged weapons and/or magic; as a fighter, you can deploy reach weapons, trip attacks, disarms or a myriad of different strategems - or simply attack his allies. You may not shine as a melee brute, but if the DM uses this strategy over and over, the party will make mincemeat of his NPCs.