I doubt you catched him already...
What I could imagine is, that Kesh is Quickmarching aswell and you got almost the same speed. Even when you move 1 meter per second more then him you will need 13 minutes to get him still.
^ this, i was 1.5 meters slower than him is all. And that was taken when i entered the city which was the closest he got to me when i stopped moving for 1 tick in order to enter. Huesby's ticks were off slightly. i would move on the minute, while he would move on the half minute. So I hadn't made my move yet inside the fief and he had made his move. Having the 2 tick rule within 50 meters basically stopped taking advantage of having your ticks slightly off from the other person in order to attack him before his tick kicks in.
P.S. Word on the street, greasy_Sage actually raged about me running that blockade while he was offline and attacked chesty in neutral raven territory over this with his friend's strat account Lord_Matthew, who gave him his login info a while back.