Hermione used a Projectile Jinx to send a rock flying to Ron’s face, catching him square in the forehead. He was bleeding from his hairline, face furious. Harry was slinging spell after spell at Hermione, but her defense had gotten better and better. She cast a large Expulso, causing dirt and debris to fly into the air. She used to not retreat, but to advance. She ran forward, casting a babbling curse at Ron. Ron was never very good at wordless magic, so he was unable to cast anything momentarily. Hermione took the moment of surprise to lower her shoulder, and drive it directly into Ron’s abdomen. Hermione was small, but someone running at you at full speed and trying to drive through your body will put you on your back if you're not expecting it. Using the momentum of his fall, Hermione quickly rolled to her feet, avoiding Harry’s spells. Casting a binding curse over her shoulder, she tied Ron up in the dirt, as Harry gave chase.