It looks like the guys that go at the chopper are warning him about people coming. After each run in you can see people or a car pass by. What's scary is that these guys are walking around with an ax. You can't see what lock the bike has but it must've been a cable lock to be able to go around that tree. Makes you wonder why they didn't just use a bolt cutter and save some time/energy. I can't see how they have an ax handy and are not able to find a bolt cutter.