*she looks up, then back down to the third year* Tani! No no no! That book won't help you, use *she pulls out a torn up book, with writing on the front. The writing says: property of the half-blood-prince* use this one.
Tani! You got it. Put it in the vial and go give it to Professor Snape, I'll clean up. *Tani puts a little into the vial and goes to give it to the professor*