When Leo saw Chris he was pleasantly surprised, in those days of hunting Chris' strength had risen from Bronze 1 Star to Bronze 2 Stars! And according to what Chris told Leo, if he had a few more days he could probably move up to Bronze 3 Stars too, since when he reached Bronze 2 Stars he had started hunting alone, which made Chris start to feel that his strength was rising much faster.
Leo knew the reason for this, as Chris was hunting alone, all the Exp that came from the monster's death went to Chris alone.
As Chris only had one skill, which was Teleportation, this Exp was split between his skill and his Rank, which was probably starting to get the total needed to reach Bronze 3 Stars.