Alas, DS hasn't been hit by electricity very often that I know of, so we have no idea whether his electrical resistance is superhuman as well. I mean, people like Bane and Superman and Lobo and whatnot have shown that they have a greater resistance to being incapacitated by electricity, so if that is to do with their superhuman strength and durability, then it would be a safe assumption to make that Slade is similarly resistant. Going by that logic, I don't think NW has enough juice on him at that moment in time to outright knock out Slade - since he didn't know that the criminal was a superhuman until he got there - and for plot reasons, it would kind of be anticlimactic if Dick just touched Stroke and he went down like he'd just been given a Vulcan Neck Pinch. XD I don't mind DS being knocked out if it's good for the plot, but at this point in time I think it would actively hinder the plot. XD So maybe not having DS get knocked out cold by the attack would be a good idea. XD