Basically, what you need to do is activate the 1st and last lasers and then let your man shoot the gun in any unused arrow spaces in order to slow him down so he doesn't get killed.
Here's what you need to do to the arrows to achieve this.
Top level: leave all arrows as they start, pointing right.
Middle level, left to right: gun, up, gun, left.
Bottom level, left to right: right, right, up, right, gun, up, up, up (this should be the square under the first double laser), gun (second double laser), up, up.
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