Oh I see! Thank you! It is answers why I have 3 ivent from time to time!
But! This event appears not each time I use ability. Just 30% of all uses. 7-th event, for example, works 100%.
Again: This is NOT an event but a value that a function (maybe a callback function in an event) will show to you.
I'm not sure what you try to achieve. Maybe you can post your source code or give us more details what is not working.
I think you're just missunderstanding it somehow.