Ron learned the hard way that Norbert's bite was poisonous. Afraid of getting Hagrid in trouble, he wrapped his hand in a handkerchief and tried to pretend that nothing was wrong, but eventually that became untenable. The stubborn redhead had to be dragged to the hospital wing by a faintly exasperated Parvati, after his hand swelled to more than twice its normal size and turned a nasty shade of greenish purple.