Two alternate scenarios I would have enjoyed watching:
1. If he were alive when they cut into his neck, there would be a lovely blood spurt and a gurgling as he drowned on his blood.
2. Drag him into the water while alive and watch him flail helplessly as he drowned.
I've found gang members to be kind and sympathetic when dispatching their rivals. They kill them first; then have fun with the bodies. I want to see the violence and pain and suffering. What good does it do for a pretty boy to die if he can't suffer? No fun!