Thanks for the comment Luv. But in a comment under definition of terms, page 147, there is this: Ordinary effort...is an objective standard in regard to any particular fielder. In other words, even if a fielder makes his best effort, if that effort falls short of what an average fielder at that position in that league would have made in a situation, the official scorer should charge that fielder with an error
I don't call myself an expert, but I've taken that to encompass mental errors. In this case, it would include an F1 failing to cover. In same cases maybe even an F3 failing to cover. Or it would cover a SS failing to get an out on a cleanly fielded ground ball because he took his sweet time making a throw, or a guy throwing to the wrong base, etc.