https://www.nasa.gov/mission_pages/chandra/images/astronomers-pursue-renegade-supermassive-black-hole.html and:
http://www.space.com/36932-renegade-speeding-supermassive-black-hole-spotted.html?utm_source=sdc-newsletter&utm_medium=email&utm_campaign=20170522-sdc#undefined.gbpl
If they have about equal mass then they tend to split again and accelerate away from each other to form a Herbig Haro system with two hotspots ( bowshocks) , often also a bar in between as the remnant of the repelling plasma/gas concentration, and two jets in between . see also: http://vixra.org/pdf/1611.0226v7.pdf
