That's when he could hear it. The chanting.
"Kill them. Kill them all."
Severus ran up behind her so he could watch the scene unfold.
The scene was frightening. Death Eaters stood in a circle decked out in their black robes and skull masks. He couldn't see their faces behind the masks, and he couldn't distinguish the voices.
The Death Eaters moved so that there was space and he could see the center of the circle.
A captive was tied up and turned away from Severus. He watched as a Death Eater brought a knife up.
Why no wand? Severus asked himself again as he watched.