If he is talked to while he is invisible he will say "Go away, you will ruin everything!" and will end the discussion there.
This section contains bugs related to J'skar. Before adding a bug to this list, consider the following:
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When talking to J'skar after rescuing him, sometimes he will have his dialogue subtitles still up, but he will not say them, and he will have a large grin on his face. This does not have any broader effects.