all potions (heal, power, endu) are instant also the ones that are not supposed to be. U can cast them while attacking/casting and there is no delay before your next attack/cast.
Issue Timeline
16 Aug 2018 Hekkus created this issue
16 Aug 2018 gruenesschaf triaged this issue
16 Aug 2018 Arctic triaged this issue
16 Aug 2018 Arctic changed the status of this issue from new to open
28 Sep 2018 gruenesschaf assigned this issue from Nobody to gruenesschaf
28 Sep 2018 gruenesschaf changed the status of this issue from in_progress to resolved