Gilliamtherogue wrote: »Leeching Strikes, as any Toggle, must be on all bars to actively benefit from it as of the Thieves Guild patch. Toggled ultimates such as Werewolf or Overload had an old exploit where you could slot things on them and turn it off, and gain all passives slots/affects without being on that bar, so it was adjusted to drop all toggles whenever you simply bar swap, UNLESS a toggle is on that bar you are swapping to.
Siphoning Attacks lasts 15 seconds however, and can be activated prior to Werewolf Transformation, meaning you will be able to have it proc for ~12s of Werewolf combat if you cast it right before entering form.