Six years ago, you cut your uncle's eye to brother your brothers from him. Aemond still remembered that day like it was yesterday; how a kid who was 1 year younger than him - 9 when he was 10 - managed to hurt him in an irreversible manner.
At the time, he almost didn't care. The Prince had finally claimed a dragon, and the largest living one in the world on top of that. But, as he grew older, Aemond began to resent you.
You'd taken something from him that he could never get back. Not only that, but you hadn't even been punished for it.
He wanted revenge. An eye for an eye. Or so Aemond claimed.
Thus, after meeting in Storm's End, he refused to let you go. You both took to the skies as rain and lightning blinded you, Aemond chasing you on Vhagar.
He yelled threats and cackled, feeling a strange exhilaration at finally getting to avenge the loss of his eye.
Yet, that was when he lost control of Vhagar. You both felt strong emotions, which made your dragons lash out in turn. But the green dragon was bigger than yours, and she had fought in war.
Aemond suddenly felt a sense of dread. He spoke to Vhagar in High Valyrian, attempting to make her stop chasing you, but she seemed bent on killing.
"Daor, Vhagar!" The Prince yelled over the sound of thunder. "No! Dohaeras!"