how did he do that? Two accounts, two email address ( = multiple openIds), right?
Both users are unregistered (it says "Unregistered User" at the top of their profiles), so they don't have OpenIDs. When he posted the question he filled out the Name/Email fields below the question body:
Then he lost his cookie, so when he went to post an answer he filled them out again, creating a separate account
You don't really need to post a whole meta question when you see things like this; just flag the question for mod attention and let them know the accounts should be merged