Well said, JetSedai, and welcome
What we really need for this situation is a portable directional EMP generator to fry the offender''s electronics "I dont know what happened to him officer, one minute he was blazing along and then he just stopped dead with smoke coming out of the engine"
Failing that, how about a huge water-balloon slingshot, or even better, a high-pressure water hose like the fire boats use?
Then again, a really loud and nicely timed (say, in the middle of a sharp high speed turn) warning shot might just scare someone into a very entertaining display of water acrobatics