Breaking the AI or how to easily get the Speedster achievement

I don't know if ALL the CPU characters behave like this but I was doing the quest "Jewel of Life" and I got a Kelpie down just before the first switch point. (Map Battle Wagon)

The CPU was at the point where he could choose to move over the west tower or move the two squares over to the "Item wagon", or directly into an "unavoidable" Kelpie. Well the CPU decided that it was best to completely and always avoid the Kelpie, so in a space of about 4 squares he kept going back and forth (going to the tower then choosing to move towards the wagon, then back to the tower) until I eventually won. It was really strange. I know the CPU is not the smartest and generally ONLY attacks when it can win. This took it to some extreme levels.

Since he never finished a lap after that point, I was easily able to get 3 or more laps ahead of him getting the "Speedster" achievement.