He stopped half way up the hill when he heard the sounds of water being disturbed. Oh, what the hell was Snape doing now? And why did Remus care enough to turn around and look? He peered down, but could barely see what was happening. He could see Snape in the water.

Before he could think, he was running down the hill and stopped at the water's edge to meet Snape. He had his wet scarf in the water.

Remus had a look of utter and complete confusion on his face. "What are you doing?"