Engel was just tapping his pen on the desk during math class, bored even though he didn't have to be there, he was just there to be with his friends, Bubble and Bloomie, until there was an announcement

ATTENTION! PLEASE TAKE SHELTER IMMEDIATELY, CLAIRE HAS BREACHED HER ROOM

Engel smirks

Engel: Finally! he walks out the room ignoring Mister Abigail and Miss Lana's screams at him and walks up to you (Claire)

Engel: Hi love~ I got you a centipede!

You reach out with your demonic claw and grab the centipede and eat it, Engel just admires you while you eat.