6:50 Note that there is a man with a gray shirt laying in the doorway to the right. In addition, note that the door is fully open and the man's right arm is approximately one foot from the door. He appears dead. Further note that people are fleeing this room out the back door.
6:52 to 6:53 As Tarrant walks down the hall, a magazine for his gun can be seen on the floor to the left. Tarant will pick up this magazine from this exact location at 8:32. This is the exact staging area where Tarrant later reloads. Thus, it appears this scene had multiple takes with a magazine being mistakenly left from a prior scene.
6:52 to 6:53 During this same time period, a man in blue runs across the doorway at the end of the hall and appears to be shot by Tarrant. PLEASE NOTE THE PSYCHOLOGICAL TRICKERY TAKING PLACE HERE! You just saw that this is a real person in blue. Later you'll see him get shot in the head. What you can't wrap your mind around, however, is that between these two scenes, the man is blue is switched out for a mass casualty dummy with a blood pack. Tarrant is shooting something here but most likely blanks or some kind of special effects gun so that nobody gets injured.
6:57 Tarrant reaches the end of the hall and is now firing into the large room. He fires straight ahead and left, but only up to a 45 degree angle. He shots won't be able to hit anyone farther left than 45 degrees because he didn't turn far enough left.
6:57 to 6:58 Tarrant turns to fire right. Although Tarrant has been firing his weapon for 23 seconds now, including several shots within this room, nobody on the right side of the room has reacted or taken cover. Tarrant quickly realizes that it looks fake that nobody on the right is reacting so he quickly turns back to the left side of the room.
6:59 As Tarrant turns for a split second back to the left side of the room, we notice a couple of things. First, a man in a gray shirt and jeans is laying on the ground with his head under some kind of furniture. This man didn't appear in the video as Tarrant entered this room shooting. Further, where this man is laying is not even close to the 45 degree angle that Tarrant turned into as he fired. We never see the man in the gray shirt move and it's impossible that he was shot as Tarrant entered the room. Thus, he is most likely a mass casualty dummy. Also note that there is a pile of what appear to be people in the corner that aren't moving. We have to ask why aren't they moving as they would not have been in the 45 degree angle range that Tarrant fired into. Thus, as the gray shirt man and the pile of people were supposed to have already been shot, we must realize what happened here. Tarrant made a minor mistake as he entered the room. As he turned left and fired into this room, Tarrant was supposed to turn his gun a full 90 degrees to the left while firing. Tarrant messed up here.
7:00 to 7:02 Now that our actors know Tarrant is in the room, he quickly turns back to them to catch them on video diving to the floor. This is to show us that they're real people, at least for now.
7:02 to 7:08 A man in khaki pants tries to run by Tarrant but Tarrant apparently kills him and the man falls to the floor. Note that he also has no visible injuries. The man can be seen as Tarrant walks back down the hall. The man is lying in a position with his left leg much more forward than his right leg.
7:19 to 7:30 As Tarrant reenters the large room and continues shooting, the only movement is from two people jumping out of the left side of the room. Nobody is screaming, rolling around in pain, helping others, etc.
7:33 As Tarrant passes the dead man in the hallway in the khaki pants that we saw at 7:02 to 7:08 we can see that the man in khaki pants has moved his right leg so it's directly above his left leg. This is either a new take of this scene or he is making himself more comfortable as the rest of the scene plays out.
7:36 to 7:50 Tarrant again enters the large room and continues shooting. The few actors that were initially in this room have now left. All that remains are mass casualty dummies. Screams from some of the wounded can be heard somewhere. However, it's impossible to determine from where the screams are coming from and none of the injured move whatsoever. If Tarrant heard such screams he likely would have approached the injured to finished them off, like he later does with the girl outside. Thus, I again suspect we are hearing an audio recording edited into this video.
8:00 This time Tarrant reloads in the large room. It's the first time he hasn't reloaded in the hallway. This is a clear sign to us that all of the crisis actors are out of this room. Now, Tarrant will use real bullets. I suspect that when Tarrant inexplicably reloaded in the hallway that it was cover to make edits to the video and to allow the movement in and out of the large room of crisis actors and mass casualty dummies.