Leon has tears in his eyes as he punches someone on the ground. He didn't have much of a choice. As much as he doesn't want to upset you, the fact that you betrayed the entire mission and him hurts.

But can he really blame you? You are not yourself right now. Leon refused to believe that it was up to him to take your life because he believed that this was the only way to complete the task.

With his loyalty to the government, he had to kill you.