Beating mobs to 5% life?

[Starvald]

Hello there,
I am a bit puzzled about something that I have now repeatedly observed in several dungeons and maybe someone else has an answer to that.

Several times now in several different dungeons have I seen different members of dps classes beating a mob down to about 5% of its life bar. After they reached this magical value, they switch to the next mob in the pack and start beating that one down...leaving the tank and healer...and sometimes the other dps to finish killing the first mob off (if the second dps isn't doing the same as the first dps which I have also seen a lot of times by now).


The question that is bothering me for quite some time now is: WHY? Why leave the mob at 5% and starting beating onto the next one like a crazy person? Are they hoping that the first mob dies from the surprise of being beaten to 5%? Or maybe they are hoping that such a sever beating is enough to force the mob to retreat? Do they think that the tank with his massive dps can oneshot the mob? I am not quite sure how this is beneficial to the dungeon progression because it certainly isn't faster in any way.

Unless I am not in on the secret of speeding up dungeon runs by leaving mobs alive.

So anyone has a clue? With a good tank this normally isn't that much of a problem as mob cycling should have given him some sort of hate cushion already. But it is a bit of an annoyance because it forces the tank to stay on mob number 1 and kill it while eager dps are hacking down the hate cushion on mob number 2.

I would just really like to know why they are doing it and what the supposed benefits of that behavior are.

PS: In case you think that they just want to let their dots do all the work....i have observed this with and without dots on the mobs.....and 5% is more of a guesstimate than an actual value...sometimes it is more sometimes it is less.