Miles ability description says that he misses unblockable specials with 105% chance and this ability is not affected by ability accuracy. I decided to use him in act 7.2.5, here one path has node which make opponents specials unblockable. But miles is not able to miss them at 105% chance. I am sharing youtube link of this issue.
@Kabam Zibiit 
https://youtu.be/SEKTnRVd1ro