Gaius wasn't trying too hard to evade, although he did want to keep the game interesting. He dodged around trees, laughing as he looked back over his shoulder at Sirius, who was gaining on him steadily. He ran around a particularly large oak, peeking around each side.
"Come on, Liebling, surely you can catch a humble little professor," he teased playfully. "Unless the tail you want is my furry one, rather than this one!"