In all honesty, Lex hadn't been paying attention to much but the decor, even while the Professor began so no, she didn't notice the Hippogriff at first. Actually...it was CASSIA jabbing at her hard in all her excitement that brought the Gryffindor's eyes to the front of the class. Yes. Here. Paying attention and here--

"Oh wow a Hippogriff. How long's he been here?" Did they get to set him on people? Was this a fully hands on class? If someone got mauled could she watch for a while before he stopped it--wait no, that would depend. Lex fixed her eyes on her bestie for a moment, yup, still sitting at a safe distance. You may begin your rampage Mr. Wonderful Beast, the Gryffindor needed a show and what better one than one that simultaneously taught why wide animals shouldn't be allowed in enclosed classrooms with children?

The good thing about having a Snake for a bestie, not having to worry they'd do something stupid to get themselves killed, so all her focus could be on the Hippogriff, yes.