Fun With A Shoulder …

[Kansas Ref]

This type of mid-post move is taught as set of counter-moves; such that A1 should be adept to either pivot away from or drop- step under to evade B1 who had established LGP. The simple observation that A1 gets himself into a "problem position" in executing his post move and is only able to solve his problem by displacing B1 (seemed like face mask was disheveled also) would render any call except an immediate PC; "rules-kicking". My C ought to have really good look at this action right.
Note that view is delimited to contests in the NF domain as that is exclusively where I officiate.