My goodness, all those people happen to be slow-witted. They had two or three seconds to cover 10 metres and catch the dog, it’s a fighting chance, FFS. Try. But they just froze, gawping, wide eyed. 100,000 years ago, they wouldn’t have lived past 30, lol.
My guess is that there were MANY people who managed to catch the dog, or were alert enough, but obviously that’s boring viewing.