Let him jump onto the ship; it's not scary (we shouldn't forget that heroes don't need a ship at all; if the others spent one turn on ambushes/landings, they would be at a disadvantage on many maps with water).
However, I don't like the teleportation of creatures from castles to each other. As a spell (something like "Call for Reinforcements" is okay), but automatically – that's too much. Either over several turns using caravans. Ubisoft gave the following explanation: buildings in the sixth game are no longer dwellings for creatures; now they are a kind of portal to the afterlife, through which these creatures enter the castles and buildings on the map. However, that's nonsense...