WINONA, Minn. — Two 14-year-old boys may face assault charges for a schoolyard beating that left another boy bloodied and bruised. The incident was about 3:35 p.m. at the Winona Middle School as students were boarding buses to go home. Video showed one older boy running up behind the 13-yrea-old and punching in the face and nocking down and then the other older boy rushing in and punching and kicking the 13-year-old, police said. Staff pulled the older boys away. The 13-year-old, bleeding from his mouth, was taken inside and triaged for his wounds.