Poor Nevill hadn't got the time to put on his pyjamas properly. He couldn't have had his jacket on when burns were found down the back of his neck or on his arm as the jacket didn't show any sign of burn holes.
His pyjama bottoms were rolled down to his ankles when he was discovered by police. So Nevill had been in the process of putting on his night clothes when he was attacked-----which would have been enough to have sent him off-balance at only being half-dressed/undressed.