There is an injury forum, but I'll help you all out here!
I was watching the game. Kolb threw a pitch that was way high and away and came up lame. He was holding the back of his right leg in the hamstring area. After being talked to and looked at, he came out of the game and was replaced by Vizcaino.
The One, The Only, The Incomparable Mercer Boy.
blog (updated 6/21 - Pirates walkout.)