Person1 – he asked him, so I think he wanted him to do it. And why should he have to spend time calling someone else and why should that person take the time to do it? And why shouldn’t Wolf “chap” the Mitzvah if he can?
There is a concept in halacha of not doing a Mitzvah if others can do it, but that is only if you would be learning Torah during that time (which Wolf did not mention as being his concern here which is why I hadn’t mentioned it in my response).
Also it seems to me that if someone specifically asks you to do something and you can do it, you have more of an obligation to say yes, and the fact that someone else can do it is only a reason to say no if you really were planning on doing something else at that time that no one else can do. And again Wolf didn’t say that he felt guilty because his wife was really expecting him to wash the dishes or he cancelled his chevrusa for this.
Another point is that I have the impression that Wolf enjoyed doing it and additionally, may have felt that it strengthened his bond with his friend (are either of those correct, Wolf?) and I’m also guessing that it may have meant something to the Bar Mitzvah boy that Wolf did it (and that he didn’t say no when asked).