Guldan able to use healthstone while silenced

While i was playing in QM as Valeera and silenced the enemy gul dan i noticed that he gained a lot of health and used the animation for healthstone, so i went into sandbox with my friends and indeed guldan was able to use the active not only while silenced but also polymorphed.
But was still not able while taunted or timestopped, and i noticed that the ability didnt grey out like the other ones like it was still usable.
So i just wanted to know if this was a bug or if it was suppose to be this way. So either fix it or update the text are both valid options.

Heya,

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