That photo is courtesy of Alki wildlife-watcher (and raft-keeper) Guy Smith, who tells the pre-photo tale:

Alki Point residents saw an eagle swooping down to the water this AM during a sea lion’s breakfast. It actually tried to get the salmon out of the sea lion’s mouth on several passes when the sea lion was slapping the fish around on the surface to kill it; similar to a dog shaking a snake. Eagles sometimes sit in a tall tree on a hill across the street and have a good view of the water, but they’re usually not this aggressive. Didn’t get a shot of the eagle, but the attached photo shows the sea lion downing the salmon.

(No proof one of them was involved, but this is still a good excuse to point you to David Hutchinson‘s fabulous Christmas photo of 2 Alki eagles, if you haven’t seen it already.)