Putting the bubble on the well at her foot is stupid and can cause immune hits. Just put the bubble on the stairs while you wait for her to drop foot. Then rush up drop well and spam light attack. There is no need for heavy. 1 heavy is a little less than 2 light attacks, but you can swing 2 times with light attack for one heavy so it’s pointless. Heavy is used when you need one big instant hit, like to kill a barrier before his shield goes up.