That bit about the cheap one being down by your knees is the real trick, and it works the other way too. Stores put the best unit price on the bottom or top shelf and the worst one right where your hand naturally falls, because they know most people grab without looking. What got me was the shelves at the end of the aisle, the ones facing you when you walk by. Those are almost never the good deal, they're just there to catch you moving fast. I started reading tags bottom shelf first and it flipped everything, the stuff I always bought was never the cheapest ounce. Your nine bucks a trip lines up with what I saw, it adds up way faster than you'd guess.

Honestly, the speed of that reaction is what gets me. A three foot move and it's already throwing out a crispy shrimp leaf, that's like the plant gave up overnight. I've had monsteras for years and they usually take a week or two to even notice a change, but radiator heat is just brutal, it dries everything out way faster than you'd think. I'd give it a few weeks and see if the new growth after this one comes in normal, if it does, you're probably fine. That damaged leaf might never flatten out, but I'd leave it for now, the plant can still use it for energy even if it looks rough.