As you see the pink goo going up his jacket sleeve, you try to spot any changes to the teacher. But nothing was happening, even though it should be doing something.
The teacher detects your plan to stall, and he starts to move, dragging you by the wrist. You suddenly get an idea after realizing the only way to get out of this mess.
You frantically try to pull away suddenly, but your weakened arms are no match for his iron grip. You twist your hand and reverse the grip, and almost immeadily, you see his hand soften and shrink.
You lunge for his head, latching onto his short hair. It starts to grow and turn lighter under your fingers.
"What the f..." The teacher said before stopping mid-sentence and starting again. "Fu... Ohhhh I just almost swore. Silly me!" He giggles and turns to you, making you let go of his head.
"Eeeeek!" The teacher screamed. "My hair is horrible! Come on, lets go fix it." S/he grabs you and runs to the bathroom you just exited and pulls you in.