Actually this is a bug. This happens if you swim below the guards. In this case you will trigger them and they will start to speak (waiting for you to say Ukabu). When i have been there, this also happened to me. I loaded back to an older game and directly swam to the stairs next time I was there. When you then reach the toad guard you can say Ukabu and he will reply without turning hostile to you.
Hope this helps...
-Fen
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