For a shot of one of Daenerys' dragons (with its 50-foot wingspan) setting fire to characters in the stadium, real fire was used. "We shoot as much as we can," explains Joe Bauer of the production, which shot on location in Spain. "For the dragon attack in the pit, we put a 50-foot flamethrower on a motion-control rig and shot the fire as a stunt. The dragon is moving all of the time, so the flames couldnt be static. [The crew also photographed] about five stunt players running at it and being set ablaze." About 13 VFX houses worked on the series this season. Rhythm & Hues animated the dragon, using a model that already was built by Pixomondo during a previous season and that included aspects of lizards, bats and birds to make it believable. CG also was used here to extend and complete the stadium, and crowd replication techniques were employed to fill the stands with spectators.