There could be multiple reasons. He might have been in a state of extreme stress or self - harm. In some cases, people who are in a very bad mental state might do something like this to themselves. Or it could be an accident. Maybe he was handling the taser carelessly and it accidentally discharged on him. But no matter what the reason, using a taser on oneself is a very dangerous act.
When a man uses a taser on himself, he is likely to suffer immediate physical effects. The electrical current from the taser will cause his muscles to contract involuntarily. This can lead to falls and potential injuries from hitting objects. Moreover, depending on the power of the taser and the length of exposure, there could be long - term nerve damage. His heart rhythm might also be affected, which could be life - threatening in some cases. In addition to the physical harm, there could be psychological impacts such as post - traumatic stress disorder if he survives the incident.
Maybe he was trying to escape some disease or a dangerous situation. Or, it could be part of a scientific experiment.
Perhaps the man was testing the taser for its range. He might set up targets at different distances and try to zap them. He could find that the taser's actual range is different from what was advertised. Or he could be testing how the taser affects different types of clothing. He may discover that thick layers of fabric can reduce the taser's effectiveness, which could have important implications for its use in real - life situations like when dealing with a suspect who is wearing a heavy coat.
It could be that the man was in a situation where he thought he needed to use the taser for protection. But instead of scaring off the 'threat' (which could have been a harmless animal or his friend playing a prank), he ended up in a comical struggle with the taser, dropping it and then trying to pick it up again while the 'threat' just watched in amusement.
I'm not sure which specific story you're referring to about a man testing a taser. There could be many such stories. It might be about a police officer training with a taser, or a civilian who got hold of one for self - defense and decided to test it in a safe environment. Without more context, it's hard to say exactly what the story is.
One possible reason could be the burden of his past. Naruto has faced a lot of hardships and the memories might be overwhelming him, making him want to be alone. For example, the loss of his master Jiraiya might have left a deep scar, and he might feel that isolating himself is the only way to deal with that pain.
Maybe he feels a sense of guilt. For example, if something bad happened in the village that he blames himself for, even if it wasn't really his fault. He could exile himself as a form of self - punishment. He has always been very hard on himself when it comes to the well - being of the village and his friends.
Perhaps he's dealing with some sort of trauma. For example, after the many battles he's been through, like the fight against Voldemort, he may be suffering from post - traumatic stress disorder. To cope with this, he isolates himself from others as he doesn't want to burden them or he's just too caught up in his own dark thoughts.
Maybe for protection. She might be in a situation where she needs to defend herself.
He may think it's a good way to keep her safe. Simple as that.