At times no matter how quiet one is, there is always something that can startle the wildlife and some of them will scatter.
I was just starting to take the picture of the turtles, when I guess I somehow (and accidentally) startled a couple of mallards, which then in turn startled quite a few of the turtles.
At least I managed to also catch the water splashing as several of the larger turtles went back into the water to “escape” the threat (me on the shore, and no where near able to get to them).
But I noticed that when they get back into the water, several others usually “pop” up from deeper in the water and start swimming along with them.
I’m sure that they all came back out and started sunning themselves again once I left the little open area that gazes into the little cove.