Thats piss poor really. Either they should both be penalised or neither of them.
I could understand if the lady had to stop the guy boarding her boat and chose an oar to defend herself, but that she jumped off her boat and went after him, swinging and missing (? Maybe she did get him i dont know) is no less premeditated.
The sad fact is that both of them, by their uncontrolled rage, have risked much.
My belief is the cops should give them both a bloody good telling off & make them do community service of some nature, together, and be done with it.