Somebody had to do some cutting from the big branch?
It's mere speculation from my part since nothing about someone going around cutting trees with a bus makes sense, it would have been a lot easier if the guy stopped his car and tried to find out what is happening, but posting on Twitter was musc more important. All we have is a stationery bus with tree branches on top, I don't see anyone busy loading the branches on the bus, we can only speculate on how they got there.
Hopefully facts will come out soon, maybe some council worker lost his marbles and couldn't tell the difference between a bus and a truck.