I wouldn't do this normally, but since im sure they can dry the place out before the next fight ..
Raise Water!
55n25e to 55n95e to the north wall 14' higher, then swim to 65n50e
or by physics -
raise all existing water 14' which covers 1/6 of arena - therefore ~2' over entire surface.
which would cut down the move to 80n60e but put us both in the drink.