TJ's reaction times were nowhere near as fast as Travis'. He was barely registering what was happening when Travis was falling against him. Putting a hand out to steady his lover was instinctive, but at that angle, he barely got a fistful of Travis' shirt before the momentum took Travis out of his grasp and left TJ with blood on his hand. It all took less than a moment and would be etched into TJ's nightmares for a long time to come.
"Derek!" He could hear Maura's startled shout, dimly at the edge of his awareness, but nothing really penetrated other than the fact Travis was down.
Calling his power wasn't a conscious thought. It was fueled by sudden fear and rage. He'd only begun trying to use his power to induce sleep after something Maura had told him about pheromones that TJ really didn't remember the details of much. But, that was how the power manifested. He knew he couldn't kill Derek with his power, but he could try to stop him while hovering protectively over Travis.