Faerie Fire

[Quidam]

Could someone look into this first-level druid spell and tell me if it's bugged?

Having recently enlisted in the military, I was fighting some Nanshi inside one of the HQs (OK, "fighting" is a euphemism for trying to stay out of trouble and avoid dying). I cast Faerie Fire on one of the Nanshi soldiers and suddenly a group of M'Cheks (only the Sergeants, I think, but I can't remember) turned Hostile and started attacking me.

I can't find any information about this spell in terms of duration, AoE, range, anything. So I don't know if the problem is with the spell or with my faction setting.

Thanks a lot.