Act natural and no one will notice

You know he's there because he fucked up and the band leader or whatever is making him sit there.

He's not sitting they're marching on the field

What is he holding?

They get deducted even more points if you pick up a dropped instrument

When you suck at band but your mom already bought the feather hat and everything

Playing some air trumpet, classic

Is this an instrument?!

I was so focused on the short girl I actually didn't notice the invisible instrument until last panel.