As Owen walked onward, he glanced back momentarily to see if everyone was following, which they were, for as far as he knew. He knew who was all in the group so far, but didn't know if he had left someone behind or not. He wasn't particularly interested in any of the conversations anyone was having, so he didn't pay attention to what anyone said... aside from Arlayna, that is. He was always monitoring what she said, sort of like an older brother, but without actually being related to her.
When he heard an unfamiliar voice, he ignored it at first, figuring it belonged to someone already in the group, but he hadn't noticed. When Arlayna said someone was late, an angry look came across his face, but not that you could see it. He thought about leaving the newbie alone, but decided against that. He turned around and saw the new guy, looked him over, then walked over to him. Owen walked up very close and grabbed this new man by the collar, lifted him into the air, saying, "Hey. Unless you want to be left behind or shot, leave with the group next time. I'm in a moderately good mood today, so I'll let it slide this one time. You won't get so lucky next time, so don't be late again." He dropped the man, turned, and began walking ahead of the group again.
A few moments later, Owen stopped, looking around without a word. He drew his gun and continued looking around, before focusing on something in the distance. He could see something moving, and he knew not to trust anything. Ever. Not even if you got to know it better. He put up his left hand, fingers straight up, signaling for the group to stop. A small click was heard, and the eyes on Owen's helmet lit up, magnifying his vision temporarily. A second later, the light turned off, and Owen said, "NCR troopers. Everyone be prepared for a firefight." He put his hand down and began moving forward, checking his sides for any signs of an ambush.