It's completely impossible to say Shea Thorne isn't afraid of Milo Sinclair making a fuss about the notebook. He still hasn't settled the account from last time at the barbecue. Now that he's seen the chaotic contents, Shea Thorne reasonably suspects that Milo Sinclair might flip out today.
So, when class was over, while Milo was still surrounded by students and Rhonda Ford was going to Jenson Hall to find Jonah Bell, Shea Thorne and Sharon Somerset went back to school with the things they bought.
The situation ahead is dangerous, so it's better to run first.
But things didn't go as planned. Just as Shea Thorne was about to leave, Jonah Bell stopped her: "Shea Thorne, the master said to ask you to see him in a while."
Milo Sinclair called for them, and they didn't dare not stay. Thus, Shea Thorne ended up being unceremoniously abandoned by Sharon Somerset and Farah Hale, resigned to follow them back to Jenson Hall.
