The problem is the thunderjaw is designed for killing things on the ground. So is the stormbird. But the stormbird is up in the air, so it has the advantage.
Battle Resume with "funny" phrases Thunderjaw: you against me alone Dreadwring: *does nothing* Slaughterspine: *the typical one who puts his name in group work but does almost nothing* Stormbird: *gets his prime after many videos of being massacred by X machine*