I sort of played with the concept with deadhand. You can see the movement interrupts the flame and it bursts out. If it's possible, theres a trick to it that I haven't figured out.
The special vid (3rd) shows a semi plain flame.
Nebula and other "white" flames are sort of invisible on default shaders. See DjBes, as I made his hand flames. Use "/dl DjBes" then "/lp 0 DjBes".