Rather than let speculation continue I'll give everyone the short version.
HSR and I disagreed on how the forum is run. Before the discussion was over he asked to be removed as an admin. So his admin privileges were removed. He was still free to post like any other member.
When I signed into the admin control panel late last week there was a notification that HSR requested the his account be deleted. Although deleting an account isn't something that we normally do we decided to grant his request.