interfere, interpose, step in, intercome, reintervene, mediate, intercede, reinterfere, participate, come into play, more...

ignore, neglect, overlook, disregard, abstain

mediate, arbitrate, negotiate, conciliate, more...

to take action,   swoop in,   use godlike force,   to step in,   come in between,   swing into action,   to take steps,   to butt in,   break up a fight,   stick your nose in