Don’t we have to wonder what an opera critic is really like, when they make a statement such as JK “paced himself cautiously and acted blankly”? I wonder how many of them have tried to sing along with Parsifal for the better part of six hours? Who wouldn’t ‘pace themself?’ As far as ‘acting blankly’, has it occurred to this critic that acting like a fool is part of the early character of Parsifal? 
Le Chant du Rossignol...(song of the nightingale) 