Ran over a nail, and I didn't realize it until the back end started to sway a little and I pulled off and the driver rear was flat. Took to tire shop and they advised there was no internal rubber pieces inside (internal chaffing) that's usually caused by driving on a flat, so that's good. They said if it was really bad, they would straight up say so and not repair, and they asked if I wanted them to repair it or not. I told them to go ahead and was advised to just keep eye on it. I took some pictures, and it doesn't seem to too bad. I would not have driven on it had I known right at that second, and not the 1/4 mile or so I drove on it. The inside sidewall didn't get as eaten up as the outside. Here are some pics. I would appreciate what you guys think safety wise, if I should be ok. Car isn't taken on the freeway that often, usually around town, 30-50mph, nothing too crazy. When I run my finger along the affected area/circumference the rubber there that would normally contribute to a rounded profile is worn down/divited/slightly gouged. No radial belts showing or anything like that. I'd like to think I'm fine, just keep an eye on it for any separation, etc. What do you guys think?