Crown of Swords in an area of Silence?

[Omagi]

Can Crown of Swords be used in an area of silence?

More specifically, if an enemy hits me and both he and I are in an area of silence, can I use the crown's immediate action to summon a Spiritual Weapon despite being in an area of Silence.

[Kalindlara]

I don't see any reason why not. There's nothing in there about command words or anything of the sort.