Viola's foot lands on something round, too firm to be one of those ordinary plastic balls. It's a potion bottle full of teal green liquid. There are enough Potions students around to identify it given a whiff: it's a Vitamix potion. [When imbibed, it will give the drinker just enough speed and strength to land a guaranteed critical - 10 Roll - on an attack.]

This potion definitely doesn't belong here. If it's removed from the memory, Viola will still have it in her possession.