Works fine on ours.

Actually, the Pacific Crest Trail section in Oregon is over 400 miles. That's more than a quick three day trip. Maybe your cousin just tried a short piece of it? Even a 30 mile stretch can feel endless if you're not ready for it. The trail really tests you from the very first hill.

Yeah, that line about the metal moving at 400 degrees... it's real. I read something similar about how heat spreads through sheet metal. You can be working on one spot and the heat just travels, makes a whole different area go soft and buckle. It's why you see guys using heat shields or wet rags now, to try and trap that spread. Makes a tough repair even trickier.