Those are rotating jet turbines. To my limited knowledge there’s no way to just stop them. They wind down even if they had turned them off. The very first article I found searching his name showed him approach a jet that was slowly moving across the tarmac, which obviously means the turbines were turning and not going to just immediately lock up if turned off.
I don’t even know that the pilots would’ve seen him from the footage I saw in the one article I looked at.
Ok