No Royal, that water on the ground is rainwater. Silas was wearing a swim diaper.
But yeah, that's the secret to a completely open pool. Show up during one of these late afternoon rain showers. They push everyone back home, are gone within 15 minutes, and set you up to have the whole place to yourself.
Hahah... Puff, there he is. (sorry had to look through the archives to see the first documentation of Silas... since we have our own, now)