When I was a kid I took a bite out of a Hot Pocket pizza and the cheese from the bit I swallowed was still connected to the whole. I almost choked as I couldn't fully swallow it and I was home alone. But I focused my breathing and then managed to slowly pull the piece back up through my esophagus by using the cheese.
I had sort of the same thing happening with a glob of rice noodles and I was quite surprised that I was quite occupied with how dumb of a death that would be instead of anything remotely helpful
I won't eat cheese sticks as that happened to me on three separate occasions. Choking is an unpleasant feeling. Which is a really unfortunate thing as I love cheese sticks.
I had to go demonstrate what you're saying, and yes, 100% possible, but impressively bad situational awareness for sure. The science has been done, thank you for this hypothesis.
It's not impossible, if the paper roll unrolled until it almost reached the floor, and it sat inside the shorts/trousers, you could get them up with the paper stuck inside.
Obviously, being old helps on the lack of awareness of the situation.