Would the small master in this video be powerless against his large black student in a real street fight?

The black guy would obliterate him. The Asian guy is tiny. The bag he is hitting is less than 6 feet tall, so the Asian guy is maybe 5'2", 115 pounds. The black guy looked to be well over 6 feet, well over 200 pounds. While skill matters more than size, in this case I think the black guy's size and strength advantage would be too much for the little guy to handle. The little guy would not be able to hurt him, even with the haymaker strikes he was demonstrating. And the big guy would only have to hit the little guy once...