Polo Rules

It can't be obstruction. There is only 3 of us, one is in goal, on is attacking the attcker the other is trying to get in an offensive and defensive position to receive a pass or pave the way for their team mate. No other sport we mention is only 3 players. Other rules from other sports just aren't applicable, the scenarios will never match up.

Exactly, pave the way for their mate, best way to put it. That video from BAD vs polosynthese demonstrates it best.