Spells will be interrupted if silenced mid cast, confirmed this on PGL using Arm of the Destroyer against the Lilith chicks in the Manor. And Bloodbath is indeed all offensive actions for the duration. A lot of skills and buffs/debuffs still have their old 1.0 tooltips so hopefully this will be fixed by then, for example Fists of Earth buff icon still says it converts attacks into earth element and constantly drains MP even though they removed that mechanic.
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