What reason(s) did Juror #8 give for wanting to talk awhile about the defendant& the trial?

The 8th Juror is convinced that he is “not sure” whether or not the boy is guilty and feels that they owe it to him to talk about the case for at least an hour, just to make sure. He cites the boy’s troubled upbringing, with his mother dead and his father jailed.

What was juror 3 cognitive bias