She falls

Suddenly caught off balance by the tearing of her skirt, Jenny staggers, neatly tearing the skirt in two as she falls backwards, landing flat on her arse, legs spread wide, mud covering her now bare legs and white panties.

Simon can't help but stare at the fallen girl, his eyes hooked on her thin panties as several other students begin to gather at the edge of the mud, watching what is happening.

Both her shoes stuck in the mud, Miss Nolan is able to kick them off and scramble finally to her feet, looking down at the two students, knowing she can't leave Jenny exposed like that to the others.