Call the cops.
This from Ohio's CCW booklet, read espesially the red letter parts;
Defense of Others
A person may defend another only if the protected person
would have had the right to use self-defense. Under Ohio law, a
person may defend family members, friends or strangers. However,
just as if he were protecting himself, a person cannot use any
more force than is reasonable and necessary to prevent the harm
threatened.
A defendant, who claims he used deadly force to protect
another, has to prove that he reasonably and honestly believed that
the person he protected was in immediate danger of serious bodily
harm or death and that deadly force was the only way to protect the
person from that danger. Furthermore, the defendant must also
show that the protected person was not at fault for creating the
situation and did not have a duty to leave or avoid the situation.
WARNING:
The law specifically discourages citizens from taking
matters into their own hands and acting as law enforcement
agents. This is true even if the person thinks he is performing a
good deed by protecting someone or helping law enforcement.
The Ohio Supreme Court has ruled that a person risks criminal
charges if he interferes in a struggle and protects the person who
was at fault, even if he mistakenly believed that person did not
create the situation.In other words, if you misinterpret a situation and interfere,
you may face criminal charges because your use of deadly force
is not justified. If you do not know all the facts and interfere,
you will not be justified to use force. It does not matter that you
mistakenly believed another was in danger and not at fault.Of greater concern than risking criminal charges is the fact
that you may be putting yourself and others in danger. If you
use your handgun to interfere in a situation, and an officer
arrives on the scene, the officer will not be able to tell if you are
the criminal or if you are the Good Samaritan.
Ohio law does not encourage vigilantism. A license to
carry a concealed handgun does not deputize you as a law
enforcement agent. Officers are trained to protect members of
the community, handle all types of situations and enforce the
law. Do not allow the privilege to carry a concealed handgun
give you a false sense of security or empowerment. Let law
enforcement officers do their job. If you want to be a Good
Samaritan, call the police.
How do I know what started it, how do I know that he didn't make a racial slur. I Don't