So, if you burn nicrosil targeting someone burning tin you just knock them out because, well sensory overload.
A nicrosil misting could even kill a full mistborn burning atium. All they need to do is burn nicrosil targeting the mistborn, resulting in them falling unconscious because of the enhanced tin. And they will definitely be burning tin in the mists. Also, though atium allows the user to see future movements of the target it does not show what metals they are going to burn in the future.