Thats suspicious, but i am pretty sure theres a logical explanation for it, without some graphicerrors or something like that.
If you play some games you know the most Predators are on the roofs at this location, so you know where you should looking at, but as i said if he didnt saw you earlier its impossible to directly see you.
You had to move into the trainyard too, so it could be possible he saw you while this.
As Recon with running perk i am mostly the “leader of my gang” and be in a high place and scout the area long befor my team catch up to me. After that we move in as four.
We cant know if he watched you from a bush while waiting for his team to arrive but its possible without you noticing it.
I never spot the Predator directly too, if i see him i just spot besides him to dont give him a clue i am looking at him.