The narrow-minded gentleman seemed frustrated. All eyes were on him. And he walked right out of the room. Juror 3 gave into the pressure of the jury. Juror 3 realized that he shouldn't have voted guilty to punish the boy for the memories he had of his son.
Some people like to make life more difficult for others.
Just like juror 3 did. He kept shooting comments at everyone in the room. Most were comments that were best kept to himself. If everyone sat down and discussed the case calmly and with an open mind it would have been solved quicker. But that's not how life really is.