From one of the submissions posted by @rooting4redpillers , the "deleted by user", I found this, something that struck me too ---

The most recent pizzagate update from Titus Frost recommends another look at the children-screaming-in-Comet video, which for many reasons was easy for me to write off. At least until recently. The more evidence we have of the very seedy activity around Comet, the harder it is to ignore this video.

Today, my final resistance died when I took another look at the video, and saw the family walk by. The father and the rest look straight ahead, past the guys playing ping pong, UNTIL another sudden yell can be heard, coming obviously from a child. The video source is across the street, so how can we know for sure where these screams are coming from? I was beginning to assume the sounds came up through the grates in the street, that the children were in the tunnels below. But this father hears the scream and jerks his head looking directly into Comet's front windows. The men keep playing as if nothing was happening, and finally the father turns back and continues on, possibly comforted by the ping pong player's non-reaction.

Another thing to note: the men outside at one point let out a yell while playing. Form this, you can tell that the yell and the screams do seem to come from the same general direction, and the difference in volume very much fits with the yell coming from outside, and the screams from behind glass (inside Comet).