I see no references to Mr. Reid being a 'guide' or even being referred to as any kind of 'guide'. The only title he is given in half a dozen articles that I read, was that of "Group Leader". And there's no indication that he had ANY previous experience with firearms.
I can name at least 100 people that own firearms and shoot regularly, but would have no idea what to do, if I handed them a Mauser (or a Springfield) with the safety in the On-Locked or On-Unlocked position. They have no experience with anything similar, and would be completely bumfuzzled by the lack of intuitive operation.
Go to someone with even less experience, in a high stress situation, and they're likely to give up on the rifle or use it as a club.
Have you ever seen the bewildered, confused look in someone's eye, as they keep flipping the magazine cutoff on, and off, trying to figure out why the safety won't turn off on a 1903 Springfield or Krag rifle? That's the level of familiarity that I expect of the average person who is handed a mil-surp of that era.