Every 4 reave must be Bigger! Its okay and its working.
Surge must cast flame reave on arrival point. It working and it supported rhythm node. All Okay.
But, if u press →
Firebrand x3 → Surge(Trigger big reave now!)-> Firebrand x3 → Flame reave (trigger big reave now, but not working)
I am just asking more questions to see if there is anything that makes the bug go away or if it works with additional procs… I have a spell blade character and the firebrand flamereave interaction works perfectly fine so there has to be something more specific to your bug.
I didnt have time to watch your video so I didnt see that you had the versatility node.
There is nothing wrong with me, thanks for asking.