Take a looksie and comment below.
Refereeing the tackle.
Refereeing the maul.
https://youtu.be/8IkMcpN2_bo?t=2m28s
https://youtu.be/8IkMcpN2_bo?t=2m28s
The Ruck/Maul (old, but still some good pointers)
https://youtu.be/nD2IOvsp1oE
https://youtu.be/nD2IOvsp1oE
YOU, the ref:-)