He grabbed him atfer he was already healed though lmfaooooo that's why he was still on his knees when he grabbed him.It was both sasuke and naruto powers that healed sasuke. If you look at when naruto catches sasuke you'll see when he yells out in anger, sasuke gets a chakra cloak. Literally 5-10 secs later you see sasuke grab naruto's arm and if you look at sasuke carefully then you will see that he has no cloak. Only explanation is that sasuke absorbed the cloak to heal himself.
If he would of absorbed it he wouldn't of still be on the floor.