Every operator in the GOM operates single engine, single pilot helicopters. It was not close to dusk as it went down at about 5:10 and sunset was not until 6:23. It was not going to make the destination of Abbeville LA in 13 minutes but this is also somewhat at the discretion of the pilot. He could have left earlier if he wanted to. Their rule could be over land one hour before sunset. At every base I worked at, this was the same thing as it was so close to the water.