human
Produce a detailed written description of a chilling scene outside the boat lake with a lake, silver slash and a heron.
assistant
Outside the shelter of the cove the lake bottom drops off sharply, and the water is rougher. The waves break now and then into small white caps as a strong wind blows off the lake. The chill of the water is not uncomfortable, but is very invigorating. Nearby the silver slash of a fin creases the surface followed quickly by a diving heron seeking its dinner.