Police helicopter crashes onto Glasgow pub
Klingonbc
That's a good point re the roof. However, the structure effectively comprised 3 parts. The top roof and then an intermediate structure before the ceiling. The top deck was severely impacted the middle section appears to have collapsed and the combined weight if the machine etc has settled/ collapsed into the pub bringing everything with it.
The initial impact created a clear "cut out" and if you look at the photographs the felt covering appears to have been blown back around the edges as air was fired out of the resultant hole.
I think the roof structure did a good job at absorbing the energy, despite the tragic loss of all crew and 6 patrons of the bar. Had the impact been at street level, one could imagine a worse scenario, possibly with fire and flying debris. Looking at the cab the impact didn't look survivable.