This kind of match needs a referee who's in full control, uses the cards well to calm the players down. Abal showed poor judgment in the pulling out of his cards. A Paraguay defender could have seen a second yellow and red, Abal didn't show that. He did show a red card to a player from Brazil after giving him 2 yellow cards in 5 minutes.
The penalty for Brazil was clear, but there was an other clear penalty situation, this time for Paraguay, but he told the players to play on, bad decision.
We had a good match with one player who was better than the others; Neymar, who scored the 4 goals for Brazil. I hope Abal gets better, because he is not going to go the world cup with this level of play.