raymond frolander , 18 , sexually abused 11-year-old boy at florida home .
child 's father walked in on assault and beat teen to pulp , then called 911 .
father told the dispatcher : ` send an ambulance . he is going to need one '
after frolander 's arrest , police released bruised and bloodied mug shot .
it was widely shared online , with users congratulating father on actions .
now , frolander has been jailed for 25 years for molesting the youngster .
will be listed as sexual predator and be electronically monitored for life .
` he 's going to learn in next 25 years why i let him live , ' boy 's father said .