Possible Clues:

• Refuse to stop as such, always being hemmed in
• Keep working hard
• Fight on when right cut breaks much of skin
• Fight on through cut to side of eye
• Show endurance, by its very nature, ever changing
• Continue (against odds)
• Keep going for each cut key
• Stick with bluish grey coating always
• Keep at it, like Percy Holmes?
• Continue steadfastly, always wearing blue