Right around 22 minutes in my cat did the same thing and I found a tiny spider web that was basically invisible unless you were cat height. Honestly though, they just zone out sometimes. Their brains don't work like ours, they process sounds and smells we can't even detect. Milo probably heard something in the wall or was tracking a dust particle you couldn't see. Tuna fix solves it every time anyway, so I wouldn't stress about it unless he stops eating or acting normal. Cats are weird, that's part of the deal.

Did you check the mirror bumper too, or just the door seals?

Did you actually see the work before the guy disappeared, @victor_carr54? Because I've seen plenty of people blame the welder when the problem was really regular rust or a bad spot on the metal. A fake number is sketchy for sure, no argument there. But sometimes folks expect a weld to fix something that was already falling apart. Not saying your buddy got scammed, just saying I've been on the other side of that complaint before. Cheap work and good work rarely look the same up front, but nobody wants to hear that when they're mad.