Is it a power of manipulation or attack?
If it is an attack, does the user have to attack (punch, kick, strike, bite, etc.) to mediate the attack or can it be directed directly at the foe (like a beam, blast, telekinetic attacks, etc.)? In other words, do you need to make direct physical contact?
If it is a manipulation, does it affect the body, the mind, the soul, the emotions, the senses or the environment?
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)