Perhaps I´m a bit biased against Amarilla and other Paraguayan referees, but if so, that´s because I´ve almost never seen Amarilla (and the others) refereeing without making a mess.
Amarilla started well ... he had to show a yellow to Alayes during the first 5 minutes, and he was OK. 10 minutes later he sent-off the same player after the 2nd yellow ... This decision wasn´t bad at all. After that, he starting with his typical concert: erroneus calls, childish booking, and hard actions without enough punishment. Amarilla likes to show himself as a severe man, but I´m sure that for most of the South American football spectators, he looks more like a clown than like a referee.
Amarilla also showed the red to Brazilian Tulio, and nobody knows the reason. He might have insulted Amarilla (in this case, Amarilla can easily get the Portuguese language). Or Amarilla just wanted to show another red, but this doesn´t seem to be very probable.