Dolphin so close 15 miles out

Was out saturday with a couple of buddys that were scuba diving so i decide to trow a ballon rig hoping to catch a king or 2not even 5 minutes after i threw it out the fight was on to my suprize it was a dolphin .nice size bull slinger .what is the deal with dolphin being so close was he lost. water temp 86.7 deg .

There are always a few caught in and around 60’ of water every year. Some as shallow as 45’. I think they will chase bait and if the bait goes shallow so do some of them. Nice catch by the way.