Always getting themselves into trouble, one way or another...but he hardly had any room to complain on that front, he'd gotten into a fair bit of trouble himself by engaging in similar activities. Although, in his own defense, he had always emerged from them alive and conscious. Eventually these habits of self-reliance enabled him to become what he currently was but that was more due to a lack of patience and a lack of adequate teachers for the subjects he wished to delve into. The least he could do now that he was in a position to be the educator would be to gather these dangerous misfits and keep them from killing themselves and each other in pursuit of power.
This was all, of course, in response to the explosion of chakra that caught his eye while he was outside of the village conducting gathering and research on the life forms out here, plus it was just nice to be away from humans sometimes...well, in theory at least. There were always more humans, sort of like cockroaches...except on fire...and screaming about it constantly....so not at all like cockroaches. As we all know, the Moon Country Screaming Fire Roach is just a rumour (a rumor he would have to determine the veracity of some day.)
Yukiin darted from his own path, bounding to the site of the explosion in a few steps of high-speed motion, dispersing with the pleasantries and restraint of walking at a normal non-shinobi pace. He didn't know if anyone needed assistance so appearing on the scene as quickly as possible was for the best. Once there he noted the fading presence of an otherworldly entity, at first assuming it belong to the unconscious victim, more likely the sparker of the explosion, but quickly determining with a glance over the body that he was still in possession of his faculties, mind, body, and soul still cohesively held together. Although lacking any chakra sight or similar endowment he was left to rely on physical indicators of such, namely that he was still breathing and that the apparition lacked much of the human form of soul he was familiar with.
It was extraplanar. A summoning attempt most likely, this was confirmed further by the scattering of materials that were commonly only used for such purposes and the presence of the seals also used in such a process. It would appear that either the victim was without a contract and attempt to forcibly pull something into this realm or he had one and tried to pull something that was beyond his chakra levels, draining him to the point of unconsciousness and failing to materialize what he was attempting to pull down to this plane. An amateur mistake.
"He should be fine, he just needs rest to recuperate his chakra." He responded, turning to face the girl. A quick examination of her told him that she was of little threat but he remained on guard regardless, prepared to strike out if she was some sort of decoy or was concealing her actual abilities. Yukiin wasn't a sensor, these mistakes could only usually be made once.
"That spirit was a failure to summon, either due to a lack of contract or attempting to call something within his contract that was beyond his abilities. It can consume a great amount of chakra to summon living beings, especially stronger ones, so it happens sometimes when young shinobi forget their limits."