Why did rob dyrdek get arrested?

It was all due to a FootLocker campaign he was starting to promote. They started fighting about the FootLocker ad he will be promoting and I heard that someone else got involved and it got physical. This is what he will be promoting (or was going to promote =) ) http://www.footlockers.biz PS - The guy in the image is one of Rob's really good friends. He might be seen on the show soon.