Here it looks more like Cav headbutted Sagan and bounced off him
https://twitter.com/mathot/status/882265676903272448
Cav definitely leaned into him. That's how I saw it. But he doesn't have a great deal of choice with the barrier fast approaching.
@peter_v started
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Here it looks more like Cav headbutted Sagan and bounced off him
https://twitter.com/mathot/status/882265676903272448