The Key

Kahn had his dragon claw stabbed in Axel's chest while the latter could only feel a hollow gap inside Kahn's. For the first time in a battle, Kahn was using one of the skills that came under Dimensional Law divine ability. 

The whole thing with Kahn torturing Axel was actually just a big distraction. What Kahn wanted to do was catch Axel off guard and make him do something that wasn't precedent. 

Unbeknownst to Axel Lobethrox… Kahn still vividly remembered 2 of the biggest loopholes of Death Absolution divine ability. 

One was that the user had to be prepared for and expect death. Death Absolution Divine Ability was an active ability that was directly dependent on the user's mind at the time of death. 

As long as they thought that Death Absolution was in Active Mode… the user wouldn't die. But if they're killed surprisingly when their mind is distracted… then it wouldn't work at all.