James Dashner said this quote

Wonder why we can do this,' he called out with his mind. The mental effort of speaking to her was already straining—he felt a headache forming like a bulge in his brain. 'Maybe we were lovers,' Teresa said. Thomas tripped and crashed to the ground. Smiling sheepishly at Minho, who’d turned to look without slowing, Thomas got back up and caught up to him. 'What?' he finally asked. He sensed a laugh from her, a watery image full of color.