I’ve been working my way through some of the older unlock conditions, just because, and I’m struck by how many of them pretty much force heroes to beat up their teammates. “Parse must have 1 HP left” “Haka must be the only hero still standing, and at full health” could theoretically happen organically, but in practice the only reasonable way to achieve them is to neutralize the villain and then have the heroes start seriously fighting themselves.
”Must lose prerequisite battles” isn’t quite the same, since you can achieve it by just hitting skip until the heroes lose, but it goes faster if the heroes punch each other instead of the villain.
The self-slaughter conditions are still relevant since the Action Hero Stuntman unlock condition is one of those, where Mainstay has to be the only hero still up.