While I am assuming that Hurl Breath would continue unchanged, does having the Enlarged Dragon Breath feat have any affect upon the AoE of Hurl Breath? The EDB was created first and thus wouldn't include it in its description, and HB was created after but oversights have happened before.
Enlarged Dragon Breath
When you use your dragon breath power, you can choose to make it blast 5 instead of blast 3.
When you use your dragon breath, you can choose to make it an area burst 2 within 10 squares instead of a close blast 3.
Now, the reason I stumbled on this is because I'm building a Dragonborn Warlord, and very intent on using:
When you hit an enemy using your dragon breath racial power, your allies gain a +5 bonus to damage rolls against that enemy until the end of your next turn.
So regardless of how the object feats play together, I'm likely going to include both along the way anyhow (it's a level 5 character).