The name red means that you have been hit by someone or you have hit the melee mode started by others, and someone has declared war on you or you have declared war on others. If you are in good and evil mode, your name may turn red, and people with knives may be within your attack range. Your pattern is good and evil, you hit him, your name is green, so you were chopped.
If you don't have a helmet, it's because you have built your own team. Just disband the team.