Well. This was an interesting, albeit odd, set of circumstances. Martha recognized the machine. Severus was beginning to wonder if perhaps the creatures drawn in to Baedal weren't so very random, after all; perhaps they were the product of memories, past interactions.

Perhaps a three-headed dog or a giant serpent might appear.

He prayed for the three-headed dog.

His wand was useless against their attacker, he decided - particularly when it was focusing its attention on Martha. He aimed at her, instead.