Okay, this is another of Rivera’s digs at the Entitlement Bros and the kind of self-absorbed people they are meant to represent. You can also tell that from his pose and accessorizing. Just how or where Jadsen came up with his own walkie-talkie is one of those things that just occurs out of convenience for the story, like the hardware in the fire tower.
By the way, with the heat that the fire must be generating, don’t you think Mark would have shed that long-sleeve flannel shirt he always wears? I sure hope he has ass-kicking deodorant.