Norm Hall/Getty Images Kyle Shanahan defended Renardo Green after he was benched. The San Francisco 49ers know Renardo Green didn’t start the fight. But coach Kyle Shanahan also wanted him to learn from being the one who was caught escalating it. Shanahan opened up about why Green was benched after his 15-yard penalty in the second quarter that landed him on the bench against the Arizona Cardinals on Sunday. Green took an unnecessary roughness call on Trey McBride he was caught retaliating