I have seen this before as well. To me they all seemed to be praying or pleading and it was if I was seeing them through a tunnel in the darkness and they were looking up towards my direction, but not at me specifically.
I saw perhaps 100s or more seemingly random people in rapid succession with no control whatsoever on switching to the next person. Men, women, no children thankfully. They all seemed to be pleading or extremely saddened or distraught. Different races and cultures too. It was quite unsettling to me and I wondered if they were victims broken by xianity or pisslam and the Gods were showing me their pain.
I always ask Satan if any entity or human form on the astral is His or not. If I encounter anything that isn't of Satan it has always instantly left me.
In my experiences not one odd entity has tested the patience of Father Satan directly if I'm afraid and call on Him. I would not worry, but if it persists ask that if they are of Satan. That's what worked for me anyway.