Thanks for the chapter!
LN explains it better but MC got the special skills, etc. unlocked like his classmates because was in same room when spell was cast on the whole room but didn't get transported because summoning formation was a circle with him outside it. If had been a square formation covering whole room to four corners would have been summoned too. Also, that sleep skill he has somehow gains experience and makes him stronger the more he sleeps. Hence how he got to level 93 with no monsters to defeat and his slothful personality. Neck chop is a skill that allows him to do a neck strike with autocorrecting force that knocks the target out without killing them or breaking any bones regardless of how weak they are or how strong he is. Like a Tamer skill or battle skill that does extreme damage but no matter how often use it won't reduce target's HPs below 1 so can weaken them to make capture easier. Old man was one of the police officers involved with his classmates' disappearance case. Will likely be explained better in ten or twenty chapters so will leave it at this.
Guess the classmates who disappeared still haven't defeated the Demon Lord yet or got wiped since none of them have returned yet. Depends on whether it's a "return home with same body/stats had before with only a moment passing" or time passes at slower/same/faster rate in original world as world summoned to. Just brainstorming, will have to keep reading and see if they or word of them pop up in one of the later chapters. Although probably won't be until 50-100ish give or take. Wonder if the god knows or cares missed a hero? In any case,