Pretty lucky, dumping fuel with that source of ignition
FFS, stop making bone comments

.
When the engine gets shut down the nasty sparky things reduce to virtually zero. Add to this the fact that the fuel dumping pipes are nowhere near the engines (and the nasty sparky things coming out the back) and you're faced with no source of ignition to get anywhere the vapourising fuel and, hence, no luck involved at all. It's almost as if someone thought of this ahead of time.....amazing!!
Yes, I know I'm being sarcastic but the stupidity of some comments and the attempts to over-dramatise never cease to amaze.
Edited to add: what Big White Bird said........he got in there whilst I was typing