[Nasuti wasn't exactly seeing Touma out, but she did spot him exit the library on her way there. She waved over to him, but by the time she had done so, his back was facing her.
She was just about to let it slide so she could go in to the library, but when she spotted the robot trailing behind him, her curiosity was piqued, and she began to follow.]
Hey! Hey, Touma! [She picked up her pace to a mild jog, pointing at the bot.] You're being followed.