For being gentle, I meant this isn't a common school. Let's take from something known instead of speculations, so, batman and superman are friends. They have been for a while. They fought each other several times. Some were even gruesome, and some wasn't of their own fault (like when poison ivy seduced superman). But they kept being friends, and haven't held a grudge over this. Our students have abilities, sometimes higher or lower from this. If we be a little harsh, it won't break them. Besides, this here is not a obligatory common school, is a place to learn to be an adventurer, which is, incidentaly, a very hard, stressfull and deadly profession. They will come for us if we are good, not if we are kind, because after they're done with this school, they'll need to face the harsh world, and gentleness won't teach them the hard parts.