CaptainRage123 was banned for hacking. It was pretty obvious, between getting hit by two people, poisoned by a witch, massacred by other mobs, and still having 19.6 health. Not only is it impossible to have a decimal in your health, but he should have been dead long before then. He was also one hitting things with simple items like carrots, or a wood sword.
Thank you to Lu_XD_Lu and Gr8ness for providing additional proof to this ban.