ToME: the Tales of Maj'Eyal

Bone Shield can't deactivate when silenced.

*edit* I'm sure this bug goes deeper then just bone shield and would go for any effect that forces sustains to be deactivated.

I think we should probably change engine.interface.ActorTalents:useTalent to accept a force argument instead of constantly adding to the mod.class.Actor:forceUseTalent. The force argument would be like the current ignore_cd one, and cause us to skip the preUseTalent check. Thoughts?