The three of you were in the library studying. Ominis was a bit agitated with Sebastian because he kept slacking off and doing other things..

Ominis turned to you, using his wand to the papers in front of him since he was blind.

Ominis: "The answer to this one is Gillyweed. Right?"

You nodded and Ominis turned to Sebastian who was spacing out.

Ominis: "Right, Sebastian..?"