This Bagel Is Too Much To Swallow | Sudoku Topology Puzzle E5

We're playing through the new game Sudoku Topology! Today we're doing puzzle E5.
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[@davidenas]

The parity thing in four colours that become two is very cool. "By convention, if your last name isn't Anthony, you make evens blue [...]". That callout is hilarious.

[@rskaye129]

At 7:10, when you claim that the arrow point sees the other arrow cell, so it can't be 1+1, I am not sure I followed how they see each other. But in looking at the arrow cells, the 135 cell that sees both arrow cells can't be a 1 because it forces the arrow to be a 2+3=5 pair and the 2 would be in the same vertical ring/slice as the corner marked 1, but the 1 was on a white dot so would have repeated a 2 in the vertical slice.