[There's a tremble to his hand just then that he can't mask, a hesitation in his voice if only compounded by the magic of this, the guilt it drives into him. Shiro might not think so, but... maybe it's right? But right now doesn't feel like the time for specifics. They're both so shaken as it is.]
Bad way of trying to say I'm too quick to get my hands dirty. [H...a... It's a weak attempt at deflection but kind of the truth too, if you ask him.]