Saying "for man" makes the word "mankind" redundant, right? Because in this particular example, the word "man", without being preceded by an article, implies man as a species, rather than merely defining movement relative to human anatomy, which would have been so, had the "a" been clearly heard over the radio (i.e. the step is small for a man, any man, any human, to take).

Does this make any sense?? 'Prolly not!

Ah, it's all wicked cool, I'm going to have a tonic and relax