When I ate cannabis in food I ate so much THC that I was unable to move at times without really concentrating, and became confused at times during the night and had a sort of psychedelic experience. Apparently this is very common when you eat too much cannabis. I have no idea the mg of THC since they were Leary biscuits made with cracker and Cheddar cheese but I ate 3-3.5g thinking that I'd have to since it was low quality.
Edibles can apparently be either really weak or way too strong and people do react to drugs differently depending on the dose, their experience, if they've got a tolerance or not, have other issues, etc.
I feel bad for this guy and may he rest in peace but as other people are saying maybe he had other issues? Did his friends try to talk him down, get him to calm down, tell him how he'd be fine in a few hours or the next day, or try to take him to the hospital, try to get him to go inside, lie down and just relax, or take a benzo if they had any or had access to one?