No it’s simply that the man tried to slow that bridge down with the lever. The bridge being much heavier than him pushed and pulled him along, he tried to brace himself into the boards but to no avail.
It’s like travelling along an asphalt road at quite some speed, when you slam the brakes you’ll keep sliding along until you stop. The road doesn’t need to be slippy for that to occur.
I asked for the why not the how
Mostly inertia. That bridge has a lot of it and a lot of leverage on him.
I’m wondering if there isn’t a slight pitch or a grade that isnt obvious from this angle
No it’s simply that the man tried to slow that bridge down with the lever. The bridge being much heavier than him pushed and pulled him along, he tried to brace himself into the boards but to no avail.
It’s like travelling along an asphalt road at quite some speed, when you slam the brakes you’ll keep sliding along until you stop. The road doesn’t need to be slippy for that to occur.
Why and how are the same thing. The answer is still physics.
Do you get confused by reflections or something?