Quote Originally Posted by Zombimode View Post
Actually, it matters because the spell has the [language dependent] tag.
Ding ding ding! We have a winner:

A language-dependent spell uses intelligible language as a medium for communication. If the target cannot understand or cannot hear what the caster of a language-dependant spell says the spell fails.
However, the deafness won't last long, and then Durkon might be in trouble.