A pity. I shall make some enquiries both here and in Europe to determine if Rodolphus sourced the potion from outside Upper Slaughter. If he hasn't, I shall put my mind to recalling what I can about the healers and brewers within the town.
Of course the students should be sent home but you know that Minerva needs more than a nebulous warning to do that. Besides, you know as well as I do that if she sends them home now, there is a good chance that Rodolphus will delay whatever he has planned and Minerva will be accused of jumping at shadows and turning into a paranoid old woman. The last thing we need right now is for the Headmistress of Hogwarts and the leader of the Order to be undermined.
I am remaining and sending Faustus to you. I shall send him tomorrow morning if that is suitable.