" dude, it's an alien. a proper alien ! " mina doesn't count when she's on land in gus' book, and yes, he's said that exact sentence about 6 times today, but he keeps seeing proper aliens. " how are you so chill about this? this is amazing! " he allows john to lead him away, vaguely aware gawking might get him in trouble, which would probably not lead to an invite to hang out again. sure, the doctor will still be there, but those trips usually involve too many near death experiences for gus' comfort.
the reminder of the awkwardness between john and mina is minorly sobering. he remembers the loneliness she clearly felt when they first met, the way she had kept him and shawn at arms length. not entirely john's fault, obviously, but still, bros before pretty boy space vigilantes. " hey! we are serious and seasoned detectives! " he can't help the immediate defense, too used to years of everyone dismissing them as clowns, too childish to take seriously. " i bet you freaked out about aliens constantly at first, besides, travelling with the doctor usually means aliens trying to kill me, let me live a little. "
lips close around the straw of the drink in his hand, a pointed look on his face. " so, what did you even do before you ended up in space? were you like a secret agent? we might as well get to know each other better while mina and shawn are off making out or something equally disgusting. " the last part wasn't necessary, he knows, but he's got shawn's back, so he's practically contractually obligated to mention that those two can't keep their hands off of each other.