Klaus had no idea what Tessa wanted to say to him, but he could see the deadly look on her face, she was dead serious. He hadn't seen her this serious before and he feared things might go wrong.
He knew this was going to happen, but he wasn't expecting to fight a grandmaster in front of Tessa, if he had known, he would've gone to the castle to kill everyone, but he had to fight the enemies that were sent to Mango Park.
Whatever the case, he did this because he wanted to let Tessa know he was capable of protecting himself and also helping her, because if Tessa had known this, she wouldn't have been careless enough to jump in the way to protect him against Eli.
He really wished he could tell Tessa everything, but he feared Tessa wouldn't be able to handle everything, would she be able to handle the real truth about him.
Tessa finally stopped in the middle of nowhere.
She sounded without looking at Klaus. Her voice was dry.