It says you shout a command, so, if they can't understand that command some how I guess it would not work. Though, its up to your GM if that shout is just for the auditory aspect of the spell and you could use body language if applicable for the linguistic aspect.
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Blave wrote:Haha good idea, but that's borderline cheating.
Insult them as a free action and see if they react?
Or (probably more likely to work) roll an Intimidation check (without Intimidatin Glare) and ask the GM if you suffer a -4 penalty because the target doesn't understand you.
The insult, maybe.
But the intimidation still costs you an action so I don't consider it cheating. It's not much different from a martial character with assurance athletics trying to trip an enemy just to see if he can - and get a feel for the enemy's reflex save in the process.