Browns' Elijah Moore appears to convulse after falling head-first to ground on tackle

There was a scary moment after a tackle on Thursday night in Cleveland. Late in the second quarter, Browns' Elijah Moore was tackled from behind on a routine play, but he went to the ground awkwardly. The receiver fell helmet-first into the playing surface, and then he turned onto his back. CLICK HERE FOR MORE SPORTS COVERAGE ON FOXNEWS.COM While he lay, Moore's head shook back and forth, which at first seemed like Moore just shaking off the hit. But then, his arms began flailing. His arms were not moving...