Patch 2.4 Notes

[Mordekhuul]

And will also make druid shift-drinking in arenas a little less potent. Probably the reason for the change.

I think it'll hurt non-druid arena healers more, since they won't be able to spam drink every time they get a half second out of combat to get good benefits from 1-2 ticks.

More specifically, if you drink at least 6 seconds you will see no change whatsoever in the amount of mana gained over the first 6 seconds.

First tick returns zero mana.

Second tick returns a full mana tick plus 66%.

Third tick returns a full mana tick plus 33%.

Basically, you can't sneak in a full mana tick by drinking for 2 seconds. if you drink 4 seconds, you get 1.66 ticks worth. If you drink 6 seconds, you get 3 full ticks worth.