It will be interesting to see what comes of this. The video appears to show the homeowner shooting them as they fled. Civilians are not allowed to shoot fleeing felons under most circumstances. But, because this happened in Kalifornia, he might face charges...... E
You cannot make that call based on that video.
There is no way to know how many bad guys there were present, based on a very narrow/limited view.
Presuming the bad guys were armed, just because they created distance between them and the homeowner who begins to fight back (which he has a right to) does not at all mean that they are not still a threat. Unless they drop their guns and throw up their hands (or some similar obvious action), they absolutely have the ability and opportunity to inflict deadly harm upon the homeowner, his family and anyone else who may be present. They are still very much capable of inflicting deadly violence upon anyone they come across.
That is a good shoot from my perspective.