Question About War Scream

I’ve had this question for a while, but what exactly is the difference between tier 1 and tier 2 warscream (warrior spell)? I see in the wiki and the official site that it adds air shout as a projectile, but even at lv 31 (tier 1) warscream seems to already have a damaging projectile. I guess my real question is what’s the difference between the projectile fired at tier 1 and at tier 2, is it longer range? Is it now technically 2 projectiles, the original and the air shout, or does the air shout replace the original? Does one have more hits than the other? Is one a larger AOE than the other? I want to know specifics, because I can’t find an answer anywhere.

 

No difference I'm pretty sure. Wiki and official site are wrong.