2014-07-12 Dunwich Dynamo XXII

I was just ahead of that first one, I heard this almighty cracking sound like breaking glass and turned around to see someone hitting the deck right in the middle of the bunch. Not sure but guessing from the sound it might Have been someone's frame or stem snapping in half??? Anyone know what happened?

I think it was a seatpost clamp failure - guy was ahead of us. Almighty crack and bits flying everywhere. Bike continued upright and in a straight line for a bit! Looked sad holding his saddle and clamp bits :(