Is that Trevor Deely passing the guy in the first scene on the clip before the guy walks after him? If so how come in the second scene the guy seems to be at the gate where they briefly conversed before Trevor Deely? Finally when the victim exits by the gate there's no sign of the guy and Tevor can be seen to have spent a few moments there putting up the umbrella etc before heading off.
In the final scene a man is seen walking after Deely but I think it can't be said for certain that it's the same guy again, it may well be though. Judging from the brief exchange between the two men I would say that they didn't know each other and I would hazard a guess that the guy was asking Deely for money and that he was a homeless vagrant type. The footage raises as many questions as it does answers but hopefully it will lead to some progress in the case.