Companions quest- Vilkas won't fight.

[DjengoPengo]

In the very first companions quest when Vilkas is assigned to test your arm he refuses to fight the dragonborn if they have active resonating crystals in their inventory.
Dropping them all immediatly activates the fight.

 

[twolargepepperoni]

Thank you for the report. This is actually a known issue - for the record, this will also happen if you try to engage Vilkas in this fight whilst playing an instrument. This occurs due to the magical properties both items have triggering a scripted behaviour from him. We are awaiting support from Bethesda to resolve this currently, as we do not want to modify vanilla scripts ourselves.