Not jail but he will be taken to, Juvenal,, if the case is serious. What is the best solution's is to walk away. It is better to keep your head then to loose it. There is always a better outcome. But when one chose the wrong direction, the consequences will stack against you. Now what if she was pregnant, you are not hurting the person but the one that is innocent of all this matter. who knows you could cause sever damage to the unborn child. The ripple effects go far into the future, what is done now will affect all those involve way into the future.
Think also of this a person who runs their mouth usually is hurting and is to proud to say I need help, cause I don't know how to deal with this. You know most cause of fights is due to loneliness or betrayal.