One of our heroes has the knockback ability (skill card I think). If another hero gets grappled, can the hero with the knockback free the grappled hero by knocking him away from the monster? I assume so, since the grappled hero isn't spending any movement points, but thought I'd make sure.
Can a hero use knockback on himself? I assume not because I don't think you're allowed to attack yourself, but what if under Dark Charm and ordered to attack yourself? Though in that case the overlord gets to pick where you're knocked to.