When you run in RT your ap should regen at a rate of 50% to prevent people from just running away from players with low range weapons and shooting them, as ranged weapons don't require you to move to attack but low range weapons do which unbalances combat. If I'm chasing a guy with a pistol and I have a flamer, he can stop to regen ap, start running when I get close and if I manage to get into range it'll just waste my ap's as he can easily run out of range once my char stands still to fire. Then I either stand there and regen ap while he shoots me or keep chasing him with no possible actions once I get close. With 50% regen during the chase, he can stop and shoot me at any point but if he does I can attack as well.