I imagine he's talking up the performance angle.
I think human characters in films can certainly be menacing, scary and even downright horrifying in film. But, yeah, leaked unofficial still shots will not tend to do that.
'If the Apocalypse starts, beep me!' - Buffy Summers
'The sky's the limit.....' Jean-Luc Picard, 'All Good Things'
courtesy of Saquist