The Hungarian pilots fly JAS Gripen a bit more aggressively than Swedish or other countries pilots at airshows, using afterburners most of the time, which is fun, it really shows the capabilities of this plane.
It wasn't a mislight what happened was the plane was dumping fuel for balance while doing its maneuver and that stream of fuel was caught in the jetwash igniting it for a brief moment, kind of like what Aussie F-111's did called the "dump n' burn" except this was unintentional and in much smaller amount