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We're seeing really weird effects: sort of...coruscation in the gloaming, bowed out lighting, suggestive of a portal or a door, but they don't stick around longer than a few seconds. It's hard to describe. We've seen a few of their people popping in, trying to evacuate, and we're playing Chaser/Bludger with them, fighting in midair as they circle around, waiting for those weird gaps to open, and they try diving through. One's made it through. Another made a dive, only to slam into something that snapped back just as he reached it. Broke his broom, and he slid down to the ground like an egg smashed against glass.

No injuries on our side yet.

Wait. Here come some more.