For whatever 'mentally sound' means. Non-violent? Not hallucinating? Well, the latter sure would be difficult to definitively prove in a setting like this.

"Hazard of the occupation, I suppose. If any other cognitive psience enthusiasts arrive I'll be quick to message them privately in precaution," Ichinose chuckled. It really wasn't out of humor, sounding entirely hollow. Oh well. "I suppose if they don't want anything to do with us, then we don't need them, either."