Spells: Immolate isn't decrimenting mob HP

[Wiltan]

A guildie was asking about druid Spell: Immolate because it didn't seem to be damaging the mob. I just tested this on a lion in North Karana -- the only spell I cast on him was Immolate.

The spell aggro'd the mob as expected, but his HP did not go down at all. After about a minute I cast Engulfing Roots on him, which did damage the mob.

I also tested on a griffenne; same thing. Finally, I cast it on myself (and clicked off regen) and took no damage.

As a control, I tested Spell: Drifting Death which worked as expected.