While Firelord is indeed an Herald, not all Heralds are on the level of Surfer, and Firelord has shown this time and again... far from it if you ask me.
Firelord has had so many poor showings. Nova (Frankie Ray) outclassed him as a Herald, Spiderman Ko'ed him, he looked like a light weight in Anihilation, he isn't even class 100, he runs at half that. Ravenous knocked him for a loop, Hercules broke his jaw with one hit.
Sorry to go against the grain but what we have here is Johnny Storm with class 50 strength, and unless he slags Ironman in the first few seconds of combat, Firelord is taking yet another nap.