What's a Temptress? 4

LANCE

We walked hand in hand inside our class. Unlike my first day on Opra, the room is filled with kids who has an air of I couldn't care less. No meanie looking, all are disciplined faces. They chatter only in their seats. They laughed, the kid around, the air is completely friendly. 

I can tell they're all having fun. Except one thing. They're smiling facial expression comes up strained. Like how you see threatened extras in movies. Knives or guns at their ribs, they we're forced to act what the perpetrator tell them to do. 

'Don't do anything stupid. Act normal,' One out of ten, that came out as super awkward and totally obvious. 

I can't understand why they're faces came out like that to me. Am I being paranoid? Or something is actually on the work here?