Li Yu saw Han and Wu Di in an intense fight at the rehabilitation center.
From a level standpoint, Wu Di was at the pinnacle of the 3-star level, expecting to level up anytime soon. His Power Source Index was over 9000 units, which meant that he should be a lot stronger than Han who currently sat at around 1000 units.
But when they really started fighting, Han actually wasn't disadvantaged too much as Li Yu expected. Wu Di, just like other espers, was used to using his ice descent abilities. When fighting against Han and getting robbed of his power, it was really hard for him to adapt.
In addition, Han's attacks were very fierce, displaying an attitude that he wouldn't give up until he died, and it was actually hard to tell who was winning.
Li Yu slightly nodded as he observed, Han completely took away his opponent's power, and then forced everyone else to fight with their lives on the line like Han was.