Glenn stops in his tracks when he sees Newt in front of him but doesn't make any movement towards the other man. He doesn’t say anything either. Even after Newt speaks first. What Glenn does do is bring down the flashlight so that he can see the newcomer better. He keeps his knife out just in case.

Sorry, Newt. He's a little on edge.

"Hey." Glenn replies, glancing at the glowing stick(?) that Newt held in his hand- how the hell was he doing that?! "It's okay. I just wasn't expecting anyone."

A scuffling noise from around his feet draws his attention away from Newt for a moment. Glenn stares at the weird looking creature, bewildered. Then he looks up at Newt again with a puzzled and slightly concerned expression.

"So, uh. You can see that thing, right?" Nodding down at the pyjak. The glowing stick would be the next thing that Glenn was going to ask about. "I'm being serious."