Rocks in the creek

We had a few hours before nap and we were all going a little stir crazy. So, we made a trip to the library. Next to the library is a walking/biking trail with a creek. We had taken the boys once to throw rocks in the creek and today it seemed like a good time killer!
The boys had a bag of rocks to throw and Lincoln had to supervise Ethan on where to throw them.
I've noticed that Ethan concentrates with his tongue out of this mouth.

When we finished the bag of rocks, Nate and Marilyn quickly said, "Let's go...this makes me nervous." On the way back to the car, I learned that they had emergency strategies planned out in their head for when the boys fell off the bridge into the water. Apparently, Nate was going to throw his phone to us to call 911, and then he was going to jump the side cliff into the water. REALLY??? That's what they were thinking??? The thought never crossed my mind. They are such worriers...