It Always Goes To Shit (гет)

What if Hans Gruber and Severus Snape were twins? What if the events in Die Hard were in part an attempt to get Severus away from wizarding Britain before Voldemort’s seemingly imminent return? What if Severus had to deal with the potential of Voldemort’s return and teaching Harry Potter on top of mourning his brother’s death? What if he discovered the birthmark he's had is in fact a soul mark? ... While this is technically a Die Hard crossover, this all takes place in the HP-verse. Reading the summaries of Die Hard & Die Hard: With A Vengeance should assist you more than capably if you've never seen them.