Out catching some nice waves this morning in Carlsbad. Had about 4 waves under my belt, then a fin pops up about 50 yards from me on the outside. The tip just out the water cruz’n back and forth. It made a turn and the full fin came out of the water about 1.2’ tall and wide. Dudes started freak’n and paddling in as fast as they could I waited to see If it was going to swim away, and then I realized..... oh shit I’m the only out!! Caught a nice wave in. Life guard on the beach calling everyone out. Dang!! Freaky!!