I was curious if the heroes of the horn actually rode any horses when they came back? maybe that's why bella had to die before the horn was blown? like was she bound to the horn? I didn't understand why bella who has been there since the begining had to die, maybe she is a horse hero reborn? lol

As far as I recall, all scenes mentioning her name spell it with just 1 "L"; not 2 "L"s.

 

I take only humans can become bound to the Horn.

Not sure whether or not the Heroes ride any animal when the Horn summons them.

Whaaaa...? I don't remember Bela dying, damn >.>