Found 4 of this species in addition to the sooties. Tossed them back as well. High winds and lots of sargassum/sea grass in the water that morning and the previous day.
San Diego County, California, US
HD videos are on my Flickr page
https://flic.kr/p/PXFCem
https://flic.kr/p/Q1qCbM
This is a picture of an Spotted Sea Hare on Hutchinson Island in Florida.
animal cast ashore at extreme low tide; no shell anywhere in vicinity; animal alive and intact; LARGE - about 9 inches in length.
Nudibranch?