the_debt_of_time

When Professor Higgs did nothing, Lily turned her eyes to Snape, who pretended
not to have heard the exchange as he stared daggers across the room at Mia.
"Some friend," Mia muttered under her breath.
That, however, the professor clearly heard as his eyes narrowed into slits. "Don't
wait around all day!"
James and Sirius were the only pair to offer a proper bow to one another, but they
were both more intent on watching their friends duel the Slytherins instead of facing off
against each other.
The moment Professor Higgs turned around and made his way to his desk to take
a seat, as he always did during practice duels, every Slytherin made the first attack.
"Expelliarmus!"
"Stupefy!"
"Flipendo!"
"Verdimillious!"
"Petrificus Totalus!"
"Impedimenta!"
The Slytherins all yelled, followed by a united, simultaneous echo from the
Gryffindors: "PROTEGO!"
Not a single attack landed.
Adrian Abbott and Damocles Belby followed the proper instructions, so Frank and
Alice were able to have a legitimate practice duel, though both Gryffindors—being
members of the A.D.—were levels above the Slytherins and easily disarmed them in the
end. Frank, being the kind of person he was, walked across the room and extended a hand
to Adrian, helping him up before returning the boy's wand. Alice followed his example
with a smile.
Seeing this somehow infuriated the other Slytherins, and someone—Mia could not
see who—threw a stunning spell at Frank, knocking him backward, rendering him
unconscious.
"Hey!" Lily shouted, outraged.
She made her way across the room to revive Frank, but before she could reach him,
the Carrow twins attacked, each sending a Stunning Spell, only one of which Lily managed
to block. The other hit her hard in the shoulder, knocking her to the ground.