644% damage

If I recall correctly: There was 1 red shell, 2 Foxes, both reflecting, and 2 other players, caught in between. The result was large explosiony things that obscured what was happening, but when it was all over and those went away, the two non-Foxes each had over 600% damage; the one who wasn't me got a total of 644% damage before dying. (Mine was lower.)

-Sniffnoy