Look where Cav is at the start of that move. His head is behind Sag's arse. Consider their speed. It's not like he's riding to work and doing a headcheck before changing lanes.
Here is when Sagan started going sideways, they're nearly level.
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Nearly != level What's the human peripheral vision angle?
He's looking ahead, he ain't gonna see him until it's too late.
Exactly what happens.
Non-intentional, no DQ. Decision is wrong.
@Sumo started
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Look where Cav is at the start of that move. His head is behind Sag's arse.
Consider their speed.
It's not like he's riding to work and doing a headcheck before changing lanes.