David reaches up to pull his mask down, pulling at the collar of his shirt to better hide it. "Yeah, just a sec."

He pulls his hat off, too, tucking it into his waistband and then bending quickly forward to fluff his hair back up again, shaking it out of his face when he straightens again. He relaxes his posture, tucking his phone into his pocket, and then nods to Aiden. "Alright, let's get outta here."

He's almost a different person like this - it's probably easier to tell why Marcus didn't ping him as anyone suspicious. Clearly he's used to blending in.