User blog comment:B214/High School DxD BorN Episode 10 Review/@comment-26474349-20150607173313/@comment-1359322-20150608014314

3. You'll get your answer when episode 11 is released. Since this part is AO, we don't know how they will go to the Dimensional Gap.

4. That fragment is a part of the Scale Mail, when Vali in his JD bite Ise, the fragment fell off, so the fragment contains the power of the JD given form by Rias' curse.