An aspiring medical student was left brain dead last month when his friends pushed him into a Louisiana lake knowing he couldn’t swim — and then looked on while doing nothing to save the drowning man, according to a report. Shocking video shows the group casually peering into the water moments after they shoved Christopher Gilbert off the dock at Lake D’Arbonne in Farmerville on April 14. At least one woman can be seen slowly entering the water before abandoning the rescue mission. It was another 10 minutes before a patron at a nearby restaurant intervened and yanked Gilbert back...