This is a forum. That means people discuss topics with each other. There are no rules that you must be posted to before you respond. Presidio9 asked a question and the polite thing to do is answer it.
That's also how to get to know people. I figured you'd want to know that, being new and all.
I've made some wonderful friends on FR just that way. Friends I hang out with when I'm home and with whom I have the best times. You might try it - it can be a lot of fun.
Actually, it's worse than that. Skippy posted a picture to me, and then got bent out of shape when I asked him to explain. He has been doing similiar things on other threads, like the typical newbie bull in a china shop that he is.