Mikasa put on her 3DMG as soon as she heard the screams of all of the other members of the Survey Corps around her. These soldiers were hardened, and not afraid of just anything. She knew it had to be dangerous, and she knew she had to protect Eren. As she heard cries for help, she rushed out to the field where blood stained grass covered the ground. It appeared that many of her comrades were already dead. How could they have been taken out so quickly? They were trained fighters! She heard the roar of the titan and instincitively knew it for what it was. It had to be a Deviant type Titan.
She looked up to see the blood stained mouth of a monstrous beast high up in the clouds. This thing was bigger than any other Titan she had ever seen, including the Colossal Titan. How had it managed to get this close to their camp without anyone realizing it was there? Just as she watched it crunch up one of her friends, she figured it out. The Titan was suddenly out of sight. It had turned invisible.
This was bad news. She had to find Eren and Armin right away. Even if it meant abandoning the Survey Corps altogether, she knew they had to get away. If she couldn't find them and escape, she would have to fight it off. Mikasa knew her chances were slim, because she knew there was only one Titan that was capable of this, and everyone had said that it was just a myth. The humongous feet she was staring at confirmed it, as they had webbed toes. She was facing the legendary Nakita Titan, face-to-toe.