Watching that video, I feel sorry for those wearing stripes and yellow at that moment.
There’s a lot not to like in that.
Initially, blue is the aggressor and certainly makes contact inside red’s frame perimeter.
From there, pinning gets interesting. Was red pinned? It’s hard to say yes. The drivers are clearly visible in the frame. You’ll notice the driver rather quickly puts the controller down and doesn’t make an effort to move. It would have been difficult to say they were pinned before the contact. Without an attempt to move, it’s hard to say so afterwards. You CAN say blue isn’t able to move. But, that’s also an “interesting” call as stated above.
It looks like blue was concerned enough they took the risk of additional penalties bringing another robot over to try to break up the issue. When they did, another red robot came in to run interference. There wasn’t any other benefit to the red robot in this instance joining.
The moment blue was able to knock blue free of red, the drive team picked up the controller and started playing again.
Looking at how any individual would interpret this in real time, there’s a variety of cards that could be applied in both directions focusing on: G18 (pinning), G20 (Stay out of other robots), C1 (egregious behavior), C8 (drawing fouls).
Watching that, it seems like a pretty impossible ask of the crew to get a call that would make everyone happy.