Cymbeline is ushered towards his cabin, but if things are that serious, surely he belongs on the deck, helping Kerem. Kerem's putting bits of turbulence into glass balls where they are more decorative than harmful. Cymbeline can do that too -

They run out of glass balls before the storm runs out of turbulence, and they're deeply in it, now.

Then a wave twice the height of the ship breaks their glass, which was boxed but not, apparently, padded well enough -

And Cymbeline cannot keep his footing in the ensuing chaos.