explosive bomb question

[flupwatson]

I have a 6th level alchemist. As I understand the vanilla bomb does 3d6 fire damage. For the explosive bomb, it states in the rulebook that creatures that take a direct hit burst into flame doing 1d6 fire damage per round. My question is whether this extra 1d6 fire damage starts from the 1st round, in addition to the 3d6 original damage, or from the second round. thanks in advance!

[lantzkev]

the key is in the part you didn't quote.

Quote:

Creatures that take a direct hit from an explosive bomb catch fire, taking 1d6 points of fire damage each round until the fire is extinguished