What can be said about the humor in this situation despite the seriousness of potential injury or death?
It's not at all funny when someone suffers an injury or possible brain damage or death. That said, there is a macabre humor in how this occurred. Seriously? It wasn't a nail gun from the tool shed. It was a planned and rather difficult process. What I will never understand is how two people arrive at an agreement to commit some crime or engage in double suicide or any of the other bizarre behaviors that we read about. We often make jokes about our own misfortunes after the fact, don't we?
No, this isn't "funny" but we will chuckle at the bizarre stupidity of the action.