He can run faster than Severus Snape confronted with shampoo.
The Meaning of This Quote
This quote is saying that someone can run faster than Severus Snape when he is confronted with shampoo. In other words, when Severus Snape sees shampoo, he runs away faster than this other person can.
The Author / Authors of This Quote
J.K. Rowling, Harry Potter and the Deathly Hallows