A lot of stocks have minute bar of wide range prices in the first few minutes of continuous trading. This seems like the incident in what caused Knight Capital fiasco, in which the system repeatedly buy on the ask and sell on the bid very fast, thus pushing the high price high and low price low. In the opening usually the market maker will be more weary of the risk they cannot hedge directly and thus will be less willing to take on positions, leading to wild swings.

Still this report (and the previous statement) does not give enough detail on why a backup system misoperation resulted this. Also, critical large systems like exchange rarely have a single point failure. Usually there will be a sequence of issues along the event chains leading to this. Thus one "failed to properly shutdown" caused all this is a bit incredible. We will need more explanation.