Unfortunately, while I can guess as much is going on in your screenshot, there isn't enough concrete evidence to hold against the accused in this one screenshot for me to log ban him for any length of time. If you had a screenshot of him saying something like "I needed your musket" or any kind of incriminating confession for me to use then I'd be all over it. Even a second screenshot of a second TK.
However, like said above I hope you'll keep an eye out for this guy and immediately submit another ban request should it happen again at any time in the future. If it does, I'll be sure to ban him as soon as I see it.
Sorry bud, nothin' much I can do at the moment.