Details, Details...

The Navy has released 3 more pictures from the Maersk standoff since the release of the Scan Eagle pictures. One of them in particular tells a bit of a story.
Note the grouping of 3 bulletholes on the starboard window. (You can see the whole image here)

It's possible that those were outgoing rounds, but otherwise it would seem that the SEALs did not take out all 3 pirates with single-shots.