The use of golden flame should not be underestimated as the bird suffered a major injury.
In the beginning, he wanted to just scare it off, after all, he was not sure where he had arrived.
But to his surprise and horror, the parts of the bird were being turned to ashes slowly.
Indeed this could be said to be going against his initial intention, but he knew nothing could be changed at the moment.
"Sigh! I guess in the end, I managed to get rid of trouble only to invite bigger trouble onto myself." He was not stupid at all. He could almost guess the trajectory of things.
Having killed the huge bird, he had to face the wrath of its family, and thus the most realistic thing would be to run, but in the sky how could that be done when the birds are overloads of the sky?
He was in a bad state, and could barely even utilize energy, his sense of reliance being domain and perception.