Note how he falls. There is a very unnatural shift in his center of gravity.
Look at how he the astronaut jumps. Even if the spacesuits were 270 pounds, a 200 pound man plus that suit would "weigh" only about 80 pounds in 1/6th gravity. Don't you think an astronaut could have jumped higher than 18 inches if a man with muscles that could support 200 pounds all of a sudden only had 80 pounds to lift?