Originally Posted by
AAKEE
About the roof/ceiling and the separate events of bang and ceiling coming down: Could it be possible that the impact destroyed /cracked the concrete roof, but it did hold together for a short while by reinforcement ? Thinking about how reinforced concrete hold together, when you break the concrete and the weight of the concrete makes the roof come down a small bit, the tension in the reinforcement increases until it snaps ?
If this had been a reinforced concrete ceiling the fuselage most likely wouldn't have fallen through. If it had, the rebars would have acted like a "net" and substantially arrested the final fall.