Quote Originally Posted by Kenji1134 View Post
In this situation, your options are to use another B3 for 220 potency then F3 without the FS proc - perhaps leading into the double-F3 speed cast if you are good at it.
Or you can use F3 with the FS proc while in UI3 (154 potency), saving you 0 casting time (fast-cast F3 from UI3 vs Instant from FS), and a whopping 133 mana.
Or you can B3 --> Thunder II --> (Transpose) F3
Guess I'm not sold that double F3 is worth the mana.