Zero and the Black Knights were able to isolate Cornelia and her unit. Tohdoh launches his unit according to Zero’s plans. Zero was finally able to surround Cornelia, and orders her to surrender. But Cornelia refuses to throw away her pride as princess and is willing to fight until death. That’s when Suzaku’s Lancelot appears and changes the turn of events.
In the end, he said, "white snow" two times, and the water dripped twice.
So, it could have something to do with the white snow that CC mentioned earlier. Or, rather why she mentioned it.