Someone has to know or believe they do of who the 2nd person is. I say because if this person is a student, then they also attended classes and so on with them. The person I would so think has also seen all the vid's and news of this and sounds of course as they have not contacted LE to say, hey, that's me. That's the thing of 'interest'. I am assuming myself there really isn't a connection, just a walker around the neighborhood, school attendee, which would be absolutely expected to be seen out and about. I thought it was unusual that MORE people aren't out walking around to and fro. Key to me is that they have not contacted LE, they also may live out of state or country, tho if just in USA, they may not of actually watched tv news on this or had their attention drawn to it by someone else that knows them.
Why would the first suspect RUN, oh so fluidly, oddly enough, away from this person seemingly. Of course the other person could catch up with them, well maybe. Running away is odd unless he did not want to be seen WITH them. The 2nd person could of probably found him, as not far ahead, but it was shown the first person alone after. All so disjointed thoughts all around, everywhere. To me, the original POI is an oddball type of person it seems to begin with, looking all overweight and odd body shaped. The stop and locking hands behind his self is just not a young or youngish guy thing to do. It just reminds me of an older European. I think people who do know him will be shocked as thought of him as an oddball, dorky kind of person. Just all IMO and I so wish they would get him safely away from anyone else.