I think Talps is employing his new found sarcasm in describing the cause of MM's bike going down being him head butting Rossi or his bike, or at least I hope so otherwise I am concerned as to his ability to negotiate reality going forward.
Mike, in some very yellow tainted worlds the general rule seems to be that Marquez caused the crash by:
1. Deliberately powering in to Rossi to bring him down
2. By (yes) headbutting Rossi's knee to make it look as though Rossi kicked him
Problem is, that in these yellow worlds these theories have gained tremendous traction such so that they are now considered the gospel factual irrefutable truth.
Try to mention any other possible scenario or apportion any semblance of responsibility (never mind blame) to Rossi and you open a 'can of whoopass' as the assembled hordes abuse to oblivion.