singleton - dead reference

Hello,

While reading "Implementing Singletons" in "Modern C++ Design" by A.
Alexandrescu I bumped into example:

//-----------------------------------------------
class Singleton {
public:
     static Singleton& Instance() {
        if (!pInstance_) {
            if (destroyed_) OnDeadReference();
            else Create();
        }
        return *pInstance_;
    }
private:
     static void Create() {
        static Singleton instance;
        pInstance_=&instance;
     }
     static void OnDeadReference() {
         Create();
         new(pInstance_) Singleton;
         atexit(KillPhoenix);
         destroyed_=false;
     }
     static void KillPhoenix() {
         pInstance_->~Singleton();
     }
    virtual ~Singleton() {
         pInstance_=0;
         destroyed_=true;
    }
    static Singleton *pInstance_;
    static bool destroyed_;
};
//-----------------------------------------------
which addresses problem of dead references due to order of static
objects' destruction. I don't get the OnDeadReference function:
why there is "new(pInstance_) Singleton;" ?
Destructor only resets pointer so when we call Create it again points to
  Singleton.

Regards

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