I've found out that it was a usage of the "motion blur" function in Toolbox 2 in the Da Vinci 2K Plus.
Instead of horizontal blurs you can use it vertically within the power windows and have it process blown highlights at extremes in the settings.
You then use a square window to limit the influences outside of the desired areas.
Hopefully this will help other filmmakers looking to get this effect without going into the high-rendering times and setup times of the flame/inferno.
Also, we've heard that this effect will look better done in Da Vinci as it would be using optical information instead of the layer info from a (damaged, as the Digital Beta is no where near film in color scopes, even in a 4K system... as Digital Beta can't hold that much info no matter what you do...) copy in compositing. I look forward to see if we can save some 2D times by doing this.
We are going into final TC tonight (it's 4:30am here ATM, been cutting all day :ph34r: ) and will be playing around with this.
Will tell you guys how it went...
Cheers...
(Edit: Spelling and specific info)