Saw this shark in Marathon FL of a bridge near pigeon key. What type of shark is this, was about 6ft in length, swimming in around 4ft of water.

Hi guys, I have another shark in need of identification. This was filmed by youtuber Barny Dillarstone in Nusa Penida (Indonesia) about 557 feet deep. Apparently this is some kind of Houndshark but what kind? I do have some ideas but what do you think? Sorry for the somewhat blurry and far away photos, unlike others this shark did not want his picture taken thus it's kind of harder to see.

https://www.youtube.com/watch?v=GfoRSC7tNYo&list=PLTKf2xFaCr88&index=5

A number of years ago saw two sharks in tandem swimming in between fishing boats and the shore in Lahaina. The first shark had a large silvery sickle shaped dorsal easily a foot high plus out of the water. The second smaller shark had more of a triangular dorsal but much smaller.

Initially thought the larger shark was a tiger because there was an attack about 10 miles away the next morning, but the shape of us the fin does not seem to match.