So when the little dragon spit his fire into the mouth of the behemoth dragon just as he was getting ready and it knocked the behemoth dragon out of comission that WASN’T POSSIBLE?
I’m shocked. OOOO. AAAAA. I will have to write someone a very strongly worded letter about this.
That wasn’t what I said at all. Toothless showed that preempting the fiery launch could make it backfire; he demonstrated it on a small dragon that was trying to steal a fish.
It was Hiccup who extrapolated the strategy to gargantuan proportions. (He also prepared the trap by degrading the flight capability first.)
And keep in mind, fuel/air explosions are entirely different phenomena from volcanic release; the fire is a match flaring up, while the volcano is a soda-can pop-top.