What Is rough but useless in a fight?

Rough but useless in a fight could refer to a variety of things, such as a craggy rock or an uneven surface that may hinder movement but provides no actual weapon or defense. Similarly, a thick, abrasive material like sandpaper might be rough to the touch but lacks any practical application in a combat scenario. Ultimately, while these items may have a rough texture, they do not contribute to one's ability to defend or attack effectively.