There have been stranger things than that. The sound persists. Weirder now, it is compelling enough to turn several heads. Out in the middle of the river, about 200 meters from the end of the dock, a large cabin cruiser has stopped. There seems to be confusion aboard.
Someone dives from the stern of the boat into the water.
After what seems like a long time a head bobs up and disappears again. The movements are those of someone in a complete panic. It finally dawns on the rowing club crowd that something terrible has happened. A husky young rower bursts from a group of revelers down by the dock. There are several seaworthy coach boats, but all the motors have all been racked and locked.