"Derek, we have to get out of here … now," I said, looking around. "Can you move?"

"I think so," he said. He tried to get to his feet, but quickly slid back down onto the ground.

"You're not going anywhere," I replied, catching his body before he hit the ground, but my hand was wet when I pulled it back from his chest. When I looked, it was covered in blood. "Derek, you've been shot!"

"Casey … go on without me," Derek said as his head lulled back. ...