by Leptoquark
Ok, let's see of I get it right...Whales destroys occupied ships (leaving their meeples at sea) while doing nothing to swimmers and empty boats.
Sharks kill swimmers while doing nothing to boats.
Sea serpents destroys occupied ships AND kill their meeples. If there are other swimmers on that boat's tile, they die too.
However what happens when a Sea Serpent meets a swimmer on a boatless tile? Does it ignore the swimmer? Same for an empty boat?