http://treebarkjacket.com/2011/05/03/innervating-a-friendpartner-nerfed-in-4-2/

Or, if you don't want to click a link, Innervate when used on people other than the caster will only restore 5% of their mana. Boo.

Ooooh. That's sad. I don't have a druid but that sucks. There is literally no reason to have that glyph if that change goes through, is there?

@TheBlob - well to be fair, they're also changing the glyph so it will still restore 10% of the casting druid's mana, but considering it's only giving 5% mana to the other person, there's not much point to innervate feeding... if 5% mana makes the difference for your other healers, they probably need to just manage their own cooldowns/pots/spells better.

Well from what I can see, this could be a benefit for healers or casters who play with a feral dps druid in their group. Previously, if a cat specced druid cast innervate on someone it was not really that useful because 20% of a feral druids mana is not much in proportion to a healers. But with the change, 5% of the targets mana pool may be more than 20% of a feral druids mana pool.

So maybe this was why this was done?