The flame burst explodes in one of the boats, scattering the men inside it. Some are now dead, others are just lucky and wet. Now they have no boat, and are forced to tread water with their dead companions.
Seeing the explosion, the men in a few of the boats quit rowing. A man in the prow of one of the boats bellows,
"Keep rowing, you lazy bastards! You can't let a few parlor tricks frighten you!" He whacks the closest rower back into action with the flat of the blade of his shortsword. They began rowing again.
OOC