OH HEY GUYS LET'S BUCKLE DOWN AND WORK REALLY, REALLY HARD WHILE MR. PIETRO ISN'T HERE

i mean

Tina spends the first lesson sitting on top of the supply cupboard and learning how to juggle. After that she thinks that if Mr. Pietro isn't turning up then she's not going to bother either. She can be found making some kind of fort on the roof instead.