Both potion attempts were... questionable.

Gideon was glad for the handkerchief he brought to his mouth as he judged the first potion. Mr. Mohr's potion was emitting such a vapour that the lad was visibly swaying on his feet—in Gideon's professional opinion, the young wizard would need a night in the hospital wing. Miss Moony's was likewise sub-par, but at least was not eminating any dangerous fumes.

"Miss Moony," Gideon declared after deftly vanishing the offending concoctions, "is the winner. Congratulations!"