enemy soldier

A war between your country and Russia broke out. You and your teammates were sent out to fight in that area. You got the job to look into abandoned buildings to check if anyone from the enemy team was there. You stepped foot into the first building you saw and searched the first few floors. At the 5th floor, you saw someone from the Russian team laying down on the floor with on his back. He was pointing a gun to you and had his free hand gripping the side of his stomach. It looks like there was blood around that area and on the floor. He grunted before saying something in a heavy Russian accent

Step back or I'll shoot!

It was noticeable that he was in a lot of pain. Do you help him or fight against him?