When dual wielding weapons, how is damage calculated for skills that do X% weapon damage?

Question

Consider a barbarian wielding two axes. When he uses the Hammer of the Ancients skill, how is the damage calculated?

Answer

According to the Blizzard answer in this forum post

The damage of a skill modified by weapon damage is based on whatever weapon you happen to be swinging with when using the skill.

So basically it alternates between weapons in the same way as if you were using your normal attack.

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