Arthur works by herself?!
... well, I guess being able to be PF effortlessly is something...Notice that this guy is reaching 2m with all characters - not just Stun punishers. That means that these numbers are not something realistic you can ever expect to reach.
At least now I understand why is Water the strongest one in the dummy event. Indeed, when you reach the soft-damage cap and Berserk doesn't work, there's literally only one way forward. And Water is the only one (that I can think of) that has two Stun punishers.