[Lucius Cornelius Sulla]

The generally accepted law of the sea is that abandoning somebody in the sea is homicide. A trial might establish justification or mitigation -- e.g. an overfilled lifeboat, which was the argument used by the Titanic crewmembers, who didn't row back to save the drowning victims. If the Titanic wasn't sinking, and they threw a stowaway overboard, they would have been hanged.

[Rembrandt]

“The generally accepted law of the sea is that abandoning somebody in the sea is homicide.”
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He jumped out of one boat because he preferred another boat that he was never invited to join. He could have swum back to the other boat. There is no homicide involved.