It seems like I'm seeing something completely different to everyone else on the Hurrell challenge. To me it looks like he pulls out of the tackle when he sees the ball has been passed and comes out of his crouch to turn around and get back, which he succeeds in doing. This causes contact with the head, but I don't think his momentum was in that direction; otherwise I don't see how he gets back to make the tackle. I've only seen the angle on the youtube highlights so could be wrong and it may have been deliberate, but I thought I'd offer an alternative take.
As others have said; the best way to get the VR to look at something isn't to cause a melee. There's nothing wrong with staying down after a shoulder charge etc. (no need for theatrics) to give them time to have a look.