Watching it in full speed, I agree it looks like that. At .25x speed, I can't say it appears that anything comes in from above. I believe the explosion began more towards the rear left of the house than it appears in the video, and the majority of the flash was simply blocked by the roof.

Watching it in full speed, I agree it looks like that. Watching it at .25x speed, it looks to me like the roof line makes it appear as though there is a firey projectile that comes in from the top/right, but it's actually just the flash/light from the explosion being obstructed by the roofline. At .25x, I can't say it appears to come in before the main explosion begins on the left side of the house.