Possible Staff 2 change.
Personally, I find it fine as it is. I like how you need to time it as your enemy uses a skill rather than just get all of its perks in one go based on conditions(ie. Weakness if skills are interrupted).
For balance’s sake, a skill interruption itself is already powerful if you use it to your advantage, let alone adding weakness onto it. Currently you apply weakness, but you only get a daze if you time the skill well.
That skill is very hard to use as an interrupt, but at least it has a low recharge. So far I’ve only successfully used it on ettin’s super ground pound, as that move for ettins is slow enough to see coming a mile away. XD
I do really like the low recharge interrupt. The mechanics are probably to balance that.