What does this mean
 

　
What's that な mean, Is it just な、or short for ない

今は彩珠学院の校長だ。。。。。野球を離れてな。。

That's a strange sentence. Where did it come from?

It is a shortened form of なさい.

I read it as "I am now the president of Azu Institute...Quit baseball..."

Yea, that's what I think. It comes from a baseball manga. there are lots of strange sentences there ,

Really?, will think about it

this -な is the particle of the emphasis with this case.
the masculine version of -ね.
it is not strange and not shortened form of なさい.

With no context whatsoever, it read like a strange sentence to me. Hearing that it is from a baseball manga it begins to make sense.

Everyone around me agrees that it is a shortened form of なさい when used in that context.

hmm, 離れてな is possible as a shortened form of 離れてなさい.
however I don't think so in that context.

国語辞典 - な
http://dictionary.goo.ne.jp/search.p...&base=11&row=3

in that context, な correspond to usage of 二.

二 （間投助）
文節末に付いて、相手に言い聞かせるような気持ちを添 える。

I read it as like MMM's post. (and I read 彩珠 = 埼玉 Saitama.)

'shortened なさい or な' is ungrammatical, but I think it's な there by my feeling.