Sneak Attack to a weak point

[nippurdelagash]

It's a great idea, but, why not in the definition of the Sneak Attack?

If Sneak Attack hit the weak point, not the vital point, the elementals can be damage from Sneak Attack, then why Druids, Sorecerers and Wizards powers change in elemental form can't be damage for Sneak Attack?, same for Spells.

Maybe its a errata or Sneak attacks its at vital point.

Sorry for my english