Starting pitcher reentering the game to pitch??

[oyaisee]

Can The starting pitcher reenter the game to pitch? would this be allowed at any level of play?

I was doing this game about a week ago and Lucky I had the bases because I didnt know the rule. It was a tournament and the kids were about 14 or so. Any way this kid starts the game and then he later comes back in to pitch. I had no clue but the other coach got upset. Well luckily it was a tournament and there was a TD he said it was ok.

He came onto the field and made the call for us! what do you think about that? should we let that happen? Luckely I did not have the plate because I wouldn't know what to do!