This is what I call the "Slack Jawed Moment". Something happens and then everyone sits their dumbfounded wondering what is the next step.
The next step is teamwork and decisive action. The officer should have taken the other officer behind the house then told the civilian to keep pressure on the wound while he covers the area. The civilian should have communicated to the officer and said he was going to put pressure on the wound while he covers the area.
Obviously, you cant do two things at once...putting pressure on the wound and covering the area so you need to work like a team together. The teamwork has to be initiated either by the officer or civilian, but someone has to put that foot forward.