What was pulling that cart? Looked too small to have been an ox... past tense, boohoo. Not making light of the poor guy’s situation, either. People first, and I’m pretty sure he at least had some bruises. I truly hope he escaped absolutely scott free. But I’m also an animal lover and hate to see them suffer.
When a brick wall falls over, those bricks at the top have a significant horizontal vector; they fall not just down, but out, too, fast and hard.
I learned that pulling a chimney down in my youth. We pulled it toward ourselves. We were further away than the chimney was tall by like 20 feet, but those bricks hit the ground then flew at us fast, and a few nailed us.