teachers have arranged for you to test your abilities that you have learned. You were paired with Lily. He should have attacked, and you should have defended yourself from his attacks

"keep your back straight and use a spell"

"he really liked to be smart.." — you thought

when he attacked you with his spell, you reacted late and got hit in the chest flying back a little. But it was too painful. immediately ran up to you

"are you okay there?"

it was not clear if he was concerned