Brienne sighed slightly. Today wasn't her day, but at least there was some sort of excitement. Potter's Army training exercises were always fun to her, and she could do them quite easily. She found a dummy hidden in the corner, and turned on the conveyor belt that pulled it towards her. She quickly jumped back, "Impedimenta!" It slowed to a complete stop and allowed her to cast the next spell. "Stupefy!" The dummy on the conveyor belt lost its head, and it rolled towards a group of people who were practicing Accio. "Accio Dummy Head!" The head was summoned to her hands, and she gripped it there. The dummy head had a couple glass eyes which stared blankly back at her, and she thought it was fascinating how it could affect her so.
She wandered around until she tapped on the shoulder of a boy from Ravenclaw that she'd not seen before. He was young, though, so that would explain it. The boy was called Dante, and was willing to help her out with Protego.
"Gimme your best shot!" Brienne coaxed.
Dante thought for a moment, "Stupefy!"
"Protego!" Perfectly blocked.
Dante then stood back a little, "Now, do me".
"Stupefy!" Brienne threw the spell at Dante, who tried to block it but couldn't quite. He fell back a little, but got back up. Brienne was impressed by this boy's ability to bounce right back.
Brienne thought for a moment. "Expecto Patronum!" The silver mist slowly formed a large fox, which ran through the room until it was recalled by the caster.
Dante tried his hand at a Patronus as well, producing a small silver tiger cub. It looked up at Dante and then faded away.