At wowhead it is said that it staks, refreshing duration and adding new total damage to the remained. On the other hand, it is v6.* comment. What about DF, did anyone test it?
UPD: just tested it on my rogue.
Single target, 5 uses of CT.
First case, letting it tick to the end each time: 31k / 40 tics
Second case, spamming AFAP: 18k / 18 tics
No worries. The mechanic is never really explained in the game so a lot of people don’t know how this works unless they actively spend time researching their class in depth