The Dink Network

I've found a dragon in a cave who could help on kicking globin's ass, then I've defeated the last man of scarab 7,ok.But when i reach the village was everything destroyed by him, ok. when i get out of dertin's house i can see alessa following someone even a cave, when i reach the end of cave, fabian gets out of my party and he tells me to go and see whats happening, ok. but when i go by the tunnel the guy who was supposed to be dertin kills alessa and then starts a fight, after i defeat him starts an explosion and i have to choose between two actions, run away or stay there, but no matter what i choose the end its bad... How can i get a good ending???I dont know , so please help me!!