As has already been suggested this is clearly just a montage of the start of the film. My stab at trying to tie it altogether, PA hatches from scar, the mother ship leaves our solar system and launches a smaller vessel back to earth for a human hunt, unaware the PA has stowed away.
The way I like to think of pred society, although there are many clans, each with their own ruling elder, they all have to answer to the largest and most powerful clan who rule over the pred home world and their elder is the emperor, 9 foot tall, acid drinking, fire pissing, ugly mother who goes on solo hunts of the alien home world and kills alien queens with his bare hands and wolf is just one of his boys.