Don't do anything, but keep your own GCD flow up. Every good WAR anticipates pacification and if timings get weird etc., they should click off their Berserk in anticipation as well to not be pacified during pickups. There is zero excuse. You can try to snipe it with Fey Caress, though, as that usually stays unused for most things (not always), and is helpful to do. (Then again that is also Embrace HPS loss, but not drastic).