Thanks for the blog! Can I add an FYI to all the officials...a dangerous play that most officials aren't aware how the rules apply...At 21:18 ...
https://www.youtube.com/watch?v=YL3VHRp0xpA
Looks like a trip made to slip, and it is very dangerous. This is a boarding call and possibly intent to injure. Happens a lot near the end of games.