Had she really forgotten to greet the Professor? Her head must still have been fuzzier than she thought. "Sorry about that Professor." Was she sorry? Not particularly but common courtesy also dictated that you offer an apology to those in authority the moment they felt affronted by whatever action you might have committed against them so there it was, an apology. Not like she'd done it on purpose, it was an honest mistake and not an act of disrespect so no real reason to be sorry.

Lex, herself, didn't want to share her reason behind anything and after her slight mess up earlier she didn't think much to go to Zeke's rescue either so instead she sat quietly and waited for that portion of the lesson to be over. When it was, Zeke was still at it and they were talking about cores.

Again, she didn't feel much like saying.

To show some initiative, she reached for her text and threw it open to the page regarding today's topic then gave as intent a look as possible but words, she didn't want to use many of those right now. No thanks. Carry on, she was paying attention.