Severus was able to get the Accidental Magic Reversal Squad deployed to set the Knight Bus upright, repaired, and sent it on its way in a matter of minutes after magic was restored. INTERCON sent its own team of Obliviators to deal with the muggle tour group at Stonehenge, while the magical fallout over Europe was minimal. I'm amazed Cissy and Bertrand pulled that off on their own. His best friend was unconscious in the Hospital Wing at Hogwarts alongside Hermione, and a grief-stricken Fleur was sitting outside of their private room as Harry was finally discharged to light duty. Severus hated himself for doing it, but he reinstated the glamour to hide his friend's baby bump and made Poppy take a wand-oath to stay silent about the pregnancy.