I wondered about that too. After watching a couple of times, I think what happened is that they used some sort of tarp or plastic to cover a bunch of things, a

I wondered about that too. After watching a couple of times, I think what happened is that they used some sort of tarp or plastic to cover a bunch of things, and part of it caught fire and burned. So, it was probably unplanned, but if everything else in the vicinity of the engine is fireproof, probably not a big deal.