Burninating Bus

I've just seen something I've never seen before. Mel called me up to her office to look out her window at a parked bus across the street, where the bus driver was holding a burning stick near the tire under the bus. He then walked around to the other side and did the same to the other tire. Had something frozen and needed thawing? Was there a mechanical issue that needed a spot of flame to fix? He was not using a blowtorch, but a long branch with one end on fire. After he decided it was properly 'burninated' (a Strong Bad reference, for all you non-Homestar nerds) he calmly discarded the branch into the half-snow covered grass next to the road. I don't know whether to be glad he's trying to fix whatever is wrong, or to think about the method of repair the next time I climb aboard a bus...