Power play, you mean powerless play

I don't understand why the Sabres refuse to dump and chase on the power play, instead of carrying it in. They have 3 guys stacked on the line, put it behind them and out race them to the puck.

And why oh why will nobody on this team screen the goalie? It works for other teams, it can work for us. Even when someone finally goes there, they skate out of there a second later. So aggravating.