Once again the moment he uses that telekinesis technique he is already able to feel the presence of every living being in that area. It is a good thing none of them have any kind of resistance, so without wasting any time he begins to control all those dark humans.
Not only that but in the next second many light beams were created and directly began to kill those dark humans without giving them the time to do anything. All of this happens in just 20 seconds.
After killing all those dark humans Sam immediately did not leave that place as he still wanted to find if there are more enemies near the stronghold or not. Sometime later after becoming sure there was nobody present in that place he decided to go back to the battlefield.