Something had been bound to happen sooner or later. The intercom cutting through the silence of the night seemed like a premonition of the worst, and Tsubaki lifted her head absently, drawn out of her concentration by the tension in Landel's voice.

The second floor?

"They must be here," she breathed as Korra said much the same. She dropped her gaze back down to the other girl. "Nobody said anything about the second floor! While we're focusing on the third floor, they must be striking a different area at the same time."

Basic strategy.