The Index Reloaded --- (Index of the Giant's Comments II)

[orrion]

Redcloak specifically says "[...]one use of my Command Undead ability[...]" Rich's quote provides no additional clarity as to whether it was the spell or the ability because Redcloak specifically mentions which one it was. Right there in the comic. He would have said 'one casting of Command Undead' or 'a simple Command Undead' or 'one Command Undead spell' if it wasn't the ability.

If he'd said 'one use of Command Undead,' then sure, it'd be somewhat vague and clarification would be beneficial. As is, there's no ambiguity. Redcloak was 100% clear.

That sums it up rather well.