Imagine that..
Ac: *Touches wrist* (could even be the Saxo in front), *swerves a bit*, *Hooks into bike*,* gets disentangled due to both riders pushing*
VK: *Feels pain in wrist*, *Looks aside*, *Feels someone meddling with his bike*, *shakes the guy of* *Swerves due to the disentanglement*
AC goes flying: two sides of the same story, still an accident.
And on the head ****... for real:
1. Nobody in the peloton mentions it, everyone accepts it
2. From the video it's unclear if VK even hits AC with the headbutt. To many it looks like swerving when something gets untangled.
And #1 is the real clincher. AC surely screwed up, but it's not an assasination attempt by VK
Everything indicates it was a simple bike handling error by AC that caused this. It actually fits right in with an annoyed VK.
For the "it can't be his saddle" crowd:
FFS.. did AC have time to consider what exactly happened except that suddenly he was stuck? It's extremely likely he wasn't paying attention in the first place. So if he gets stuck on the rear brake cable it's mighty close to the saddle(-stem). It's not an extreme stretch to say "I got stuck with my hoods at his saddle".
For the "why didn't they all stop"
Noticed how little help people waiting are if you immediately get up? As long as you are within the cars waiting is pointless. I have seen quite a few times people waiting actually doing absolutely nothing but expend energy while desperately trying to overtake the victim who speeds buy at 60 behind the bumper of the DS. Keeping your domestiques fresh might be a better idea....