I had an issue with a few locals on the MUP a little while back, fortunately they didn't get their hand on our first encounter. The second time we crossed paths I had a nice, brightly polished piece of heavy gauge aluminum tubing, about 3 1/2 feet long, 2" diameter, with a little bit of weight at one end and handlebar tape grip at the other, slipped into my mess bag for an easy draw like a samurai sword. Unfortunately (fortunately for them) I didn't get my hands on them the second time they saw me - I drew "excalibur" and they changed posture from blocking the MUP and challenging me, to runing away from the mad guy on the bike cavalry-charging and yelling like Mel Gibson in braveheart'.

They have actively avoided me (walked a safe distance away from the MUP) every time we've crossed paths since.