User blog comment:TheBlueRogue/E3 2013: Ask your questions about Assassin's Creed IV: Black Flag/@comment-4829046-20130611024208/@comment-3046679-20130611170409

Because it was another ship? Didn't you see the second-to-last bit? First Ed holds the crystal-cube thingy, then someone looks at him and his crew through the spyglass.

Then it zooms out to show the observer aboard Delizia.