When you combine positive emotions not quite meeting the eyes (ok, what I really mean is that cold, dead eye thing); the concentrated assessment of others required to identify and duplicate appropriate emotions; and reduced blink rate, you get a pretty intense stare.
This is commonly referred to as the ‘predatory stare’. This is not an unfair characterization in light of the fact that overlaying these factors, the psychopath is also continuously evaluating your use to them and capacity to be taken advantage of
https://narcwise.com/2017/11/27/6-visual-signs-that-betray-the-psychopaths-truth/
