But even if it did go through, it seemed like the damage would be limited to one party. They wouldn't both go through necessarily so not exactly double spending. Only one gets accepted. I think it was just meaning that someone could potentially rug a transaction and get it mined first with a higher fee, but I don't see how one party could do such a thing to another party without controlling the network? It's beyond my understanding of how Monero even works to be honest. But it seems worthy of consideration at least.

Maybe it is a double spend somehow but I think the conclusion was that the signatures still exist and one would get rejected, potentially the non-malicious one. Not sure the impact of that though. Doesnt sound like losing fund but that's where my understanding of Monero transactions break down.