It makes sense to me that it's a vision issue, I feel that I was affected more by the first part than the second and did the majority of my passes under braking bc I tend to not trust most riders in novice enough to pass them on the outside mid-corner after seeing them swing excessively wide mid-corner. I'd just go under them (and be just fine doing so) if it were a legal pass but I get why that rule is there and stick to it for that reason.
I like passing under braking
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I see you over there seeing me, do you see the me I think you see?
