J.D.Salinger. The catcher in the rye
Джером Д.Сэлинджер. Над пропастью во ржи (engl)
If a body catch a body coming through the
Is it a case of subjunctive mood?
I am not a teacher but I don't think this is subjunctive; i'd say this is for rhythm, the line is supposed to be part of a song and saying "catches" would make the sentence heavy sounding.