He is very fat and soft and already suffers much.

After a day in the sun also he will be weak.

Moreover I do not think that he can swim, for eunuchs hate the water.

So if he gets out of the boat it is probable that he will drown in the river, since he dare not wade to the quay where the guards will be waiting.

But if he does escape by swimming across the river, he will hide for his life's sake and never be seen again, and if by chance he is caught, he will say that the seal fell into the water when he was taken to the boat, or that one of the guards had stolen it.