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London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
@JonoMarshall
The forearm thing is for this reason, the idea is that a straight arm (shoulder or forearm) used to protect your space (as opposed to an elbow) is ideal. This then extends to checking where both players are looking to bounce off each other/fight for space/fight for the ball.
Maybe shoulders/forearms should be the sub-text of a "straight arm" kind of ruling (or "unraised arm" or something), essentially it's about safely protecting your space and checking as opposed to extending your elbow, forearm or hand out to enable you to push/shove/chicken wing/etc someone.
The more I think about it, the "raised arm" thing doesn't work either as tall players can still push shorter players around without a raised arm.
Maybe it's about where the force comes from? So you can push/lean/check with an arm that's planted on the bars (non-mallet side) and the other side has to be a curled/tucked in arm (Rory's blind-side style above)?