Warlocks Getting Buffed

[Kevin]

I thought the reset timer for the DR was much longer....closer to 30 seconds, but I haven't done extensive testing.  As for the "let them beat on you comment", most PvP fights last about 10 seconds total, unless you're fighting a smart paladin or a lucky warlock so letting them hit you isn't much of an option.
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Well not stand still, you move around you run from them so they are chasing you while the 15 second timer is running, etc. You can get them in the wrong facing or get out of range in PvP. I was being loose with my terms.

From the patch notes:

Spells must be used on the same target within 15 seconds of the
  *end* of the duration in order to be diminished. In other words, if a
  target hasn't had a slowing spell active on them for more than 15
  seconds, the next slowing spell will have full effect.

So I'm still not sure. The first sentence makes it sound like what I described above, the diminishing returns timer starts when the first effect hits them. The 2nd sentence makes it sound like the diminishing returns timer starts to run at the end of the effect of the first cast. I love patch notes. :)

Again I could be way off on the diminishing returns thing. But if it works like I think it does, it isn't as bad for locks as I think they make it out to be, though against udead with a trinket it gets pretty ugly regardless. But since their immunity is 20 seconds you are out of the diminishing returns regardless of how it works after they use that. It also gets a bit uglier against a dwarf priest but that is a much smaller set than all undead.