He left out the parts of "precision" being that he hit the guy. That he hit the guy in his exposed just fine neck. The guy wearing as he did, armor that left his neck and some area below it exposed. That's not Bullseye. He didn't pull off some mega accuracy shot. The argument that he'd thus do some kind of hyper accurate kill shot on Sauron thereby despite Sauron, even just for the same target area having a helmet going down it, and steel chain and plate where it doesn't, in his generally heavy steel armor requires... ignoring that.
The other argument, that he'll, what, spear off his finger from range? Requires again, armored gauntlet, ignoring that the sword that did so was not normal vs a bronze spear, and the like, and also having shown nowhere the accuracy for that. And Sauron maybe not conveniently sticking his fingers out to be hit for sake of plot.