When people acquire power, they have the opportunity to abuse it, notes Michael J Perotti, a clinical and forensic psychologist in Loma Linda, California.
Casillas was also in inspired form and made one breathtaking save just before the interval as he kept out Renato's point-blank effort from a Diego Perotti cross.
The hosts doubled their lead 20 minutes from time when Diego Perotti swung over a corner and Fabiano headied the ball into the path of compatriot Renato to score from close range.
Angola striker Manucho put the visitors ahead in the 33rd minute with a glancing header from Diego Costa's cross but five minutes later Borja Fernandez was red-carded for a lunge on Diego Perotti.