Kept surfing in that spot
Walked down the beach to a new spot nearby
Sounded the alarm! and demanded everyone get out of the water
I was at Duck Pier in the 80's and a school of saucer sized manta rays kept jumping out. Later there was a truck at the Wee Winks with several tiger and hammerheads hanging off the tail gate.
But like I said, fishing has given me a pretty clear indication of whats in certain waters. I have seen some large sharks hauled in off the OB pier before, like legit ones... But out of tons of times fishing in the surf and on the coast of CA, I have never hooked a shark there. Never. Not even by accident....
Fish time I fished here in Carolina, the first thing I hooked was a black tip. Then another. Then another. And this is 15 yards off the surfing beaches. Then we went to the shark hole and ohh my gosh. Put a chunk of mullet on there a little larger than the size of golf ball and on my first cast I had a healthy 4-5 footer on the line.... This is also the day my buddy got bit by a black tip right on his foot (Thank you SI member from JAX who mailed me that anti-shark band to give to my buddy. To date, he has not been bit again =)...
My final thought here, is, I guess I am glad that the water is always murky here. If it was clear like NSB, I would probably cut my sessions short quite often.
I have caught many sharks in the surf...sometimes when fishing for reds in early September, I end up catching non stop sandbars, aka brown sharks. It gets so bad that I just give up...they can range up to 6'...so if you surf and you don't see any, certainly doesn't mean they are not there. They are everywhere...keep surfing...at least in the mid Atlantic area.