The exact exchange is:
Haku throws needles, Naruto deflects, Haku strikes and attempts to hit Naruto, Naruto dodges and then grabs him, breaks all his mirrors, Haku states he can't hold his chakra back anymore, gets punched, and stands up, and says he's finished. The previous chapter, Haku states "I can't let this fight go on! My own art forces me to expend a great deal of chakra, so there's a limit to how long I can go on using it!", before immediately going for Naruto. His attacks are even stated to get weaker as it goes on.