There's no telling how many "Tributes" there actually are scurrying like lab rats through this hellhole, though evidently not so many that they're impossible to avoid. His running into Nick probably never would have happened if not for that dead end. So what are the odds of there being more than one Beth.

"Beth Greene?" he presses, becoming more animated than he had been, grasping after this little spark of hope. Nick clearly has his attention with that. "You seen her anywhere? That's who I'm lookin' for. We were in a bad spot, pinned down..." He trails off without elaborating further. Even if Nick does know her (his recognition had seemed sincere), there's no need to get into the ugly details. All that matters is getting to her.

With a renewed sense of urgency and the empty beaker still in hand he's moving through the room, only to be brought up short by the rows of lasers that have abruptly flickered to life before him, barring their passage to the door beyond, which presumably leads back out into the spaceport proper. He looks back to Nick with his eyebrows raised, wearing a you've got to be shitting me expression.