How is Leon from resident evil being hunted by legion a 16 year old in a mask

1. Legion consists of 4 members, with only Frank's age being described (19). Susie has cosmetics that refer to her as a sophmore, but that's about it.
2. You could apply this to MANY of the Survivors, including some of the originals. Ace, David, their OWN Survivor Jeff, Jonah, and Haddie would all realistically beat any of the Legion in a one on one fight (provided they were disarmed, the knife CONSIDERABLY increases the Legion's threat level).

Now, for an actual answer. Every Killer has their strength altered by the Entity to FAR beyond superhuman levels. That is the reason someone like the Legion is able to kick pallets apart, bring down professional fighters, kick down walls, pick up and carry around a large and heavyset man like Jeff with one arm, and sling them onto a hook suspended several feet above the ground with the same level of ease as the Oni, an 8+ foot tall massive hulk of pure muscle.

I could give you a longer explanation but to keep it simple, entity.

Honestly, Geralt could probably dispatch half of the killers with ease. Survivors are all just hamstrung in the realm.

Jill Valentine, Carlos Oliveira, Chris Redfield, David King, the legendary skin for Renato, in real life they would just beat the heck out of them

But yeah, Entity