A second-wave puzzle in the Old West has you rescuing some folk from a fire in the old mill.
First step- take out the guy with the flame thrower at the front door.
This will cause his buddy inside to open the door to face you. Smash him too, then activate the rune within.
This is slightly trickier than most runes of this pattern, because of your starting point. Still, the strategy is still the same- complete one shape, then complete the other, but this time one will be clockwise and one counterclockwise. Solving it allows you to open a portal upstairs, to the civvies and a hackable lazer maze.
Run the maze to open the door here, and win a brick.