Is it possible that they simply had said accelerants spread out on site, and billowing the building full of gas mixed with fire lanterns would result in simultaneous engulfment? Given what little remained, establishing points of origin seems a bit unrealistic.
I've also read the theory that Suresh had everyone hide out in the bunker while he and a couple others lit the fires.
I've also read the theory that Suresh had everyone hide out in the bunker while he and a couple others lit the fires.