It was pretty much pure chance for Marco to be in the shuttle bay when the explosion happened, and he wasn't sure if he should call that being in the right place at the right time or the wrong place at the wrong time. In any case, that just meant he was a witness to the subsequent freaking out and confusion, especially after the surviving shuttle managed to dock and discharge its load of bewildered newcomers.

He's head to toe in Eclipse armor, a combination of paranoia from people recognizing him as one of the mercs and being opposed to walking around in the open without some layer of protection. Of course, that doesn't actually make him any more of an imposing figure than usual, since the armor doesn't make him any taller. So, call it a pleasure at seeing someone who also wasn't contributing to the population of big scary dudes on the station, as well as a fascination about aliens that still somehow hasn't faded after being on a space station for months; he laughs when the grey lump of grump rolls off the shuttle.

"Hey, complaining is my job! The party's only just starting!"