Dorsal Fin or Pectoral Fin?

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Dom

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I just read an article about two surfers escaping the pursuit of a shark In P.R.

The picture is a still of the video. There were no injuries. In the article, they made reference to the shark's dorsal fin being visible. But it looks like the pectoral fin to me, as though the shark rolled over to it's right side exposing the left pectoral.

Thoughts?
 

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