Bridging?

[bellnier]

Okay, there's no specific definition of "bridging" in the law book. There are many instances where a player in the ruck is in a low stance, balanced on his/her feet, with hands on a tackled player. Some referees will always call this bridging, but others use the criteria that if his hands were lifted and the player does not fall over then he/she is NOT bridging. I suppose we could say that the player is preventing the tackled player from rolling away, but that might be a stretch too. Opinions?