How the Canto Bight kids learned about Luke's actions on Crait

I like to think they overheard an arms dealer explaining in awe why his shipment to the First Order was delayed. Something like "They were doing a standard search and destroy on a resistance base, when Luke Skywalker, that old Jedi master who I honestly thought was dead, just appeared out of nowhere. He withstood a barrage of AT-M6 like it was nothing, dueled Kylo Ren himself without taking a hit, then just VANISHED INTO THIN AIR! He made Ren look like a fool and the resistance got away!" via /r/StarWars https://ift.tt/2NbL9mD