1?The DK of Permanent buff has 6% injury-free blade barrier, which rely on two blood runes at the same time waiting for the cooling state to maintain sustained after every refresh 10s.The requirements seem very low, as long as a double blood rune appears every 10s with consuming state.
 But in fact, when double blood runes are waiting for cooling, another DK core skill called Rune empowerment has a chance to refresh the Blood Rune, which lead to the number of death hit reduce. While the latter is an injury-free core of the DK. Theoretically the four Rune charge can be exchanged for an extra die to play. And every time blood rune character to play, it is equivalent to a waste of 1/4 death blow. Final conclusion is that the DK need to brush Double Blood Rune every 10s, but also try to save the time in that state.
However compared with 20% attack speed and 10% physical damage debuff, maintaining the blade barrier is approachable just like an angel .If you make a little effort in skills you also be maintained in the loss under the premise 6% injury-free. But first of all the double debuff needs to use the skills of three almost completely outside the loop likes disease outbreaks, Icy Touch and plague to fight.
 And it greatly increases the skill level of tension bar. Secondly, the two of them wrest resources with death strike. If one day Blizzard makes defense talent of changes has a change likes these: active skills, Knights throw shield boss caused by physical damage reduced by 10%, which continuing 21s.

 2? Knight takes five seconds to picked up to throw the shield can’t be during the block at the same time, and then get a gift to strengthen defense: each of point talent defense caused the debuff duration increased by 4s and up to three-point 12s.And then in two hours, the official website Forum will be countries Tan riding threat to delete the posts of the drowned. But in this situation the DK tanks from 403 to suffer in silence now and there is no signs which modified in the foreseeable future.
The present situation is that the Knight oblivious to maintain the double debuff, the soldiers spend a little point effort and the DK need to go through the psychological agony: whether or not it would make up in the end? The single debuff and disease-free have become a genre.
 The data show that far more than half a minute debuff effect a dead play, 20% attack speed decreased 10% attack power which can reduce the physical DPS of the boss up to 28 percent, and then you still should try to keep the two-disease combat strike.
  The Knight Light gives 10% physical damage to a group of strange through hammer to the brain. But it is no way to slow down 20% for a group of monsters, and then cut the target trial which can only do every 8s .The  soldiers in this area show a long-standing rule of force, two of them on the debuff skills for groups. There is decent opening hatred, but it is no pressures as the upper hand.
The DK can take the double debuff to the group of stranger, but it will need to use the same plague assimilation which no longer cycle before the count of three.