Those are SOOO hard to get.
You can freeze the action for a screengrab, and the dragon is froze, but the fire vanishes. The pic I posted is exactly that. I was getting BBQd ;)
The other option is a split second f10 key where you see the fire during ‘action’ but before the light from the fire/the fire itself obscured the dragon.
It can be done. But it’s a crapshoot.
Yes, even the still pictures I found of dragons only had one or two out of dozens that showed them breathing fire.
Don’t spend too much time on it, my friend. I have “enough” for now, anyway.