Polo Rules

In my opinion the ice hockey idea/comparison only makes sense if face cages become mandatory and the "blast zone" is defined.

And as the NHL eventually realised, having mandatory face protection solves all these problems.

Visors were only made mandatory for this season, for new players (anyone who was already playing at that level it's up to them, at their own risk).

I'm not saying this will happen in bike polo any time soon, but I think it's the only realistic option, as no penalty will ever stop hits to the face.