I am likewise troubled by the connection between Snape and Black. You were far enough ahead of their year that you likely don't recall, and Snape was not often forthcoming about the conflict, but my experience while tutoring Snape, and Barty and Regulus, made it quite clear Snape and Black loathed each other to the point of their feud consuming not only their own cohort, but the others around them; it far exceeded the sort of schoolboy rivalry Hogwarts produces and rose to the level of lifelong vendetta. I find the prospect of their making common cause exceedingly implausible.

I suppose treason makes strange bedfellows.

What a miserable clusterfuck this all is. I cannot help but think we have not seen the last of it. I trust you know that if there is anything I can do to be of use, you have but to say the word.