It didn't work up much of a sweat and really saved a lot of hand digging.
I agree with no one should be in line of a pull.Wow, very very dangerous. Never allow anyone to get in the line of pull especially when you are using a strap since it is elastic. In the future, at a minimum throw a moving blanket over the strap, but I would just use a chain. I pull shrubs and stumps out all the time with my tractor and my SUV and always just use a length of chain.
Very impressed with your tractor build BTW. Funny thing is, it would probably make an incredible rock crawler.
A guy on a neighboring farm got his big IH tractor stuck. They tried pulling it out, pulling from the rear with one of those ropes that stretch. Well the rope broke and decapitated him. We never used those ropes on our farm.