Naruto ran past, stumbling a bit. He turned back in time for Sasuke's taunt. 

"Just you wait!" he retorted as Sasuke ran toward him next. 

Naruto charged back in too, undaunted. He slowed slightly and swayed from side to side, trying to keep up with Sasuke's weaving. Then a punch was aimed at his head and he bent in half to duck, instead of leaning back. Now his head was pointed at Sasuke's chest. Then he was suddenly tripped and fell forward even faster and lower so that his head connected with Sasuke's stomach. Naruto had a hard head but the impact still made him dizzy. As they fell, Naruto scrabbled for a loose grip on the other boy's clothes so he couldn't roll away.