When someone uses Alchemist's Fire (either correctly, holding a melee weapon, or incorrectly, holding a bow) the "throw grenade-like" animation is played and the chat log writes "PlayerName threw a grenade-like object" or something.
However, Alchemist's Fire isn't like Acid Flask or Firebomb (which really are grenades), it is merely poured over your weapon to light it on fire for a bit. I believe it should therefore show the "use special power" animation instead of the grenade animation... Again, a minor bug... *shrugs*
Keep up the good work!