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If nobody goes to the police, there is nothing to be concerned with. If one of the persons goes to the police, the other one might get charged with a criminal offense. Both men are adults, so the ages are not relevent to this question.
An assault, depending upon the facts and circumstances can be considered an aggravated felony by immigration, which would make it potentially a serious offense for either person if they are non-citizens, but more particularly for the one who has only been here for three years, if the case is not handled correctly.
Right now there is no case, but if there ever is one, neither person should try to fight the case without an experienced attorney.
It doesn't matter what the third person does. He is not a witness to the crime and if the first and second person don't want to get charges pressed, nothing can happen.
If the second person reports the first person's crime, then the first person's residency can be affected IF he is convicted of that crime. The second person can complain about the third person. That is an entirely separate matter and has nothing to do with this argument. There is no reason the second person cannot report the torture he is experiencing from the third. It has nothing to do with the fight with the second person, which he does not even have to discuss.
The problems between the first and second person do not have to be discussed in order to report the third for an unrelated issue.
I answered your last question already. Our replies must have crossed.
Just checking in to see if you need more help or any clarification of my answer. If so, please reply here on this question thread.