Channeling the wrong background image?

[That was probably some Mundane reference that Magnus hadn't taught him since it definitely didn't sound like anything his boyfriend had talked about while 'talking shop' with Alec.]

Magic leaves traces but is there anyone here powerful enough to track them? Everyone here with magic of some type has had their powers deadened. If they took us to a dimension different than the ones we're from, it'll be harder for anyone back home to use those traces to find us.