"You have declared war on this realm which I have sworn to protect," Thor said in his booming son of Odin voice. Not only had he grown to care for those in Everett, he fully agreed that his Jane was out there somewhere, protecting herself and her friends. He would not let this world turn to waste at the hands of this lesser god. It was his duty to protect the earth from anyone or anything.
Loki shot at her with his magic which gave him another chance to strike again. This time he went at her and swung over and over again with his hammer. He thought he had her on the defensive long enough for Loki to end her but she regained her ground and sent him back once again. This one was much more powerful than he would have predicted.
"I am Thor, son of Odin," he proclaimed and saw no reason to hide his identity from her. Loki may or may not have disagreed, but Thor wanted her to know who she was up against and would defeat her.
All of that pride may have not left his system during the exile to earth the first time.
"Leave these people be and you will be granted amnesty. If you continue to raise your army or harm those under my protection, you give us no choice other than to be destroyed."
Swinging the molninja im his hand for a moment, he had a bemused expression on his face. Did she truly think she could take on this world and not be punished for her actions?