Note where the gate is in this picture. This is the bridge directly south of TB's fortress. The position of the gate is such that one would not notice it in time when running under the bridge. As it leads to another town, the person entering it is not asked if they would like to enter.
The gate leads to a point in a Minax controlled town that is surrounded by guards! :) Can you guess how FactionsGimp died?
..if you couldn't guess, maybe this poor TB falling for the same trick will give you a clue. :>