Look at this walkthrough :
At 02:23 : strange camera angle, like someone hiding. Clem will slow down. She will intentionnally look at the camera (like she is looking someone). This is not random, as it has been programmed purposely.
Then, just the next sequence after that, she looks at the walkie talkie, and asks if she can have it.
I am sure she saw the walkie guy, probably he made her a sign to not tell. This also highlights where the guy was observing you from.