Guild Wars 2

Ok, i saw this grandmaster trait in Critical Strike line yesterday, i thought it was the only thing that could make people chosing this line, but then anet did a change:
No Quarter: Instead of extending the duration of a single stack of fury, this trait will now apply its own stacks of fury to avoid allowing fury to reach unintended durations.

Now i’d like to understand how it works, if this way:

Fury
[—————]
.hit…………[—]
…….hit…………[—]
………….hit………..[—]
in this case i could use this trait to gain a decent amount of fury according to duration of original stack, quite usefull.

Or it works this other way:

Fury
[——————]
Hit[—]
…………..hit[—]

in this scenario new stack duration overlaps the old one and you can just gain 1-2 stack at max, imho kinda useless for a grandmaster trait.

P.S. sorry for bad english ^^"