another rescue at rivenroar question

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(This question is for DMs.. if you are planning on playing the adventure, don't read this)

In the 2nd encounter with the ogre, the ogre's description says it throws at cask for -1 vs reflex and 2d6 fire damage.
But then on the cask's description, it says that the cask explosion is 3d6 fire damage, dex vs reflex.

The way I'm reading this, it means that a direct hit from the ogre (which is unlikely) will result in 2d6 damage. Then anyone caught in the burst explosion takes 3d6 on a dex vs reflex attack. But whose dex vs reflex ?? The ogre's? Does that mean +4 vs reflex? -1?