Not incredibly surprising. The event was before even Colin knew her, and he only learned of it on the network when Kostos tried to find out who did it.

"Well. Probably while you were downstairs." A gentle way of saying when you were locked up. "There was no one near her at the time, but she was pushed down the stairs. Not tripped. Someone used magic to push her down the stairs. She saw a bit of their shadow, I think, but that was all. She broke her arm and never knew who did it. She and Kostos tried to figure it out, but never came up with anyone."

Just talking about it, he's starting to get angry again. He can feel his chest tightening, the rush coming back to his ears.