Possible Clues:

• Moved in furtive manner, edged along
• Sidney did not go straight, but he was still leading
• Walked laterally
• Sidney was the leader but did not go straight
• Sidney was the first to get on edge, perhaps
• Sidney edged his way to the front
• Moved in furtive or cringing manner
• Never went straight and never worked hard at last
• Didn't move forward, maybe
• Advanced coyly