You can make the ability to dogdge based on athletics skill. At zero you can't do anything. At 2, a short side-step. At 4, a dive to the side. At 6, a dive and roll (more distance faster). At 8, dive, roll, and get back to your feet at the end of your roll. At 10, same as 8 but you can either swing your weapon or put up your shield as you stand up.