From the overtime procedures section: 
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				If the defensive team gains possession, the ball becomes dead immediately and the offensive series of downs is ended.
			
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 Ok, so no pick-six or fumble return for TD or blocked FG returned for a TD or anything like that.  Got it. 
But then, a bit later, there's this nugget:
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				If a safety is scored by the offensive team, the succeeding spot will be the 10-yard line of the team that was on defense, provided that the defensive team has not had its series of downs (temporary overtime score is: Team A 2, Team B 0).
			
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 My question: 
Under what possible circumstance can Team A score a safety in overtime?  The down ends as soon as Team B gains possession of the ball, and Team A cannot score a safety unless Team B is in possession of the ball.  What am I missing?