How did the shooter get onto the roof? Did he bring his own ladder and set it up earlier or was one in the area? Or did he access the roof from a ladder already secured to the building? How long was the counter sniper in place? How long was the sniper laying down on the roof? Have you ever lain on a metal roof in the summer heat? It's pretty warm unless you have some sort of insulation. The shooter would not have laid on a hot roof for 15-30 minutes. His skin would have cooked. Same with the counter shooters. Some ting wong.