Some hotfixes have been pushed to live servers which includes some changes to Demon Hunter sigils.
Sigil of Silence Cooldown
Sigil of Silence’s cooldown has been reduced to 1 minute.
Sigil of Silence – Place a Sigil of Silence at the target location that activates after 2 sec. Silences all enemies affected by the sigil for 6 sec.
Cooldown reduced to 1 min
When Precise Sigils is talented, sigils will no longer immediately aggro targets when sigils are cast.