While towing, what is the principal danger in attempting to swing a barge on a short hawser in order to slow the barge's speed?

Correct Answer: Option A — The barge may swing too quickly and run over the tug.

Using a short hawser severely limits the reaction time and turning radius flexibility. Attempting to swing a heavy barge on a short towline causes the barge to pivot violently and maintain high forward momentum, risking running over the tug before headway can be checked.