dilema

I was walking along the creek in Franke Park when I heard some person ahead on the other side. Then,

Splash!
Splash!

So, although there was no fire, I was left with WTF? I looked in time to see the jerk there lob a rock at a high rate of speed toward the bank. I heard ducks quacking, so I understood his target. I walked up to see a something feathered fighting in the water. I had my camera with me. The man was clearly guilty of cruelty to animals.

I thought the dying thing was the mother, no. It might be the father, no. It was a poor duckling, half-killed. It floundered on its side, apt to drown. So ... why didn't I take his picture, call the cops, make a scene ...

His dog beside him. He had, what looked like, a Dire Wolf. It was massive. Now, I'm not worried so much, but, I can only assume a man who would kill or half-kill a duckling would easily injure or torture animals, like his poor pet there. I could not be sure if the dog would be a trained killer. Only a small creek separated us and the dog, swimmer or not, would catch me easily despite my initial advantage.

So, was I wrong to merely make myself known so that he would walk away from the scene, or should I have made a scene? I really wanted the guy arrested, if for nothing else than a warning. What a sick jerk, yet I feel unhappy that I seemingly did nothing.