Paul and Lethen woke up about fifteen or so minutes after Lucius' powers calmed down and returned to the normal scope for a Beginner Rank. It was simultaneously fortunate and not that he did not have access to such strength all the time, but if he did, his back would simply be a large target and nothing more.
When the two men did wake up, they came outside and saw the body of the man from the mist and his severed hand that Lucius was holding onto. He wanted to put it in his storage ring, but apparently there was a block built into the enchantment that prevented the collection of human body parts. To be fair, that felt like a smart move, otherwise murderers and assassins could simply hide their kills and that would be a nightmare for everyone.