>>546277793
https://www.youtube.com/watch?v=ft3b1-Cm-0M

I may be schizophrenic but I swear Torrent Volley regens around 50 energy instead if you use it at around 70 energy during burst with focus.
In non esoteric ponderings, you can use Arrow rain to recover your energy out of combat slowly, useful when preparing for last boss in M5's.