Poor troll. Looks like he was turned to stone. Did he see the sun? Or was it something else? Can you devise another means of turning a troll to stone?
Maybe they’re not really helpless at this stage. Maybe they’re most dangerous when they’re stone. Maybe they only appear to be made of rock.
The possibilities are endless.
And if your Muse inspires you to greatness, please come back here and leave me a linky. I’d love to read what you come up with!