Under the pretext of holding up a measuring cup to see if he'd poured out enough armadillo bile, Harry sneaked a sidelong glance at the pair of them. Karkaroff looked extremely worried, and Snape looked angry.
Karkaroff hovered behind Snape's desk for the rest of the double period. He seemed intent on preventing Snape from slipping away at the end of class. Keen to hear what Karkaroff wanted to say, Harry deliberately knocked over his bottle of armadillo bile with two minutes to go to the bell, which gave him an excuse to duck down behind his cauldron and mop up while the rest of the class moved noisily toward the door.
"What's so urgent?" he heard Snape hiss at Karkaroff.
"This," said Karkaroff, and Harry, peering around the edge of his cauldron, saw Karkaroff pull up the left-hand sleeve of his robe and show Snape something on his inner forearm.
"Well?" said Karkaroff, still making every effort not to move his lips. "Do you see? It's never been this clear, never since - "
"Put it away!" snarled Snape, his black eyes sweeping the classroom.
"But you must have noticed -" Karkaroff began in an agitated voice.
"We can talk later, Karkaroff!" spat Snape. "Potter! What are you doing?"
"Clearing up my armadillo bile, Professor," said Harry innocently, straightening up and showing Snape the sodden rag he was holding.
Karkaroff turned on his heel and strode out of the dungeon. He looked both worried and angry. Not wanting to remain alone with an exceptionally angry Snape, Harry threw his books and ingredients back into his bag and left at top speed to tell Ron and Hermione what he had just witnessed.
They left the castle at noon the next day to find a weak silver sun shining down upon the grounds. The weather was milder than it had been all year, and by the time they arrived in Hogsmeade, all three of them had taken off their cloaks and thrown them over their shoulders. The food Sirius had told them to bring was in Harry's bag; they had sneaked a dozen chicken legs, a loaf of bread, and a flask of pumpkin juice from the lunch table.
They went into Gladrags Wizardwear to buy a present for Dobby, where they had fun selecting the most lurid socks they could find, including a pair patterned with flashing gold and silver stars, and another that screamed loudly when they became too smelly. Then, at half past one, they made their way up the High Street, past Dervish and Banges, and out toward the edge of the village.