The officials are standing in front of it until nearly the last moment. The lead rider might not have been aware of an immovable object until just before she started to move out.I find the leading rider's very late swing out and failure to communicate hard to understand. Not that's she's responsible for the accident but she could have done an awful lot more to prevent it happening. Inexcusable marshalling though.
It is amazing how the bike just fell apart!
What on earth made you think that? Carbon fibre is incredibly strong against the forces it's been designed to resist but weak if another force is applied to it. Just as an example, take a seatpost. Incredibly strong if you apply pressure along it's length but incredibly easy to crush by overtightening the seatpost clamp.I thought carbon fibre was unbreakable? It seems it isn't!