His arm didn't explode.
He was hit with a baseball bat pretty fuggin' hard and it caused a massive hematoma. He then had to have a doctor open it up so that some of the blood could drain because of the hemorrhage.
Some people would accuse him of synthol injections...but he said he never did that. He said he used steroid site injections to stretch the muscle fascia and fill out.
Gregg is a freak and he is a real nice guy. He did run with seedy crowds but I think that most of us have at one time.
You can talk to him via message board at http://www.musculardevelopment.com/forums
As long as you are not an a**hole, he WILL respond to your posts.