In the infirmary, students could be seen grouching one after another as they just came back from their session with Klaus.
Klaus gave instructions not to completely heal any student so that their body could heal naturally and grow stronger like that on its own, those with minor injuries were ignored.
But of course those who don't want to wait for their body to heal on it's own can just use the healing potion if they wanted to but klaus already adviced against that also but won't force anyone as you can't really force anyone to be strong if they didn't want to besides Klaus didn't really care, he just gave the advice and left it at that.
Anthony and his friends could be seen walking out of infirmary without any injuries or bandages on their body.
Well, only the Storm brothers were actually injured in the first place which Evelyn healed just by waving her hand.