Strikes thrown once a position of control was established on the ground. Other man was unable to escape and effectively helpless.
A skilled grappler may employ this position effectively depending on the situation. However, standing headlocks are commonly used by those who lack grappling skills. This is often not only ineffective, but dangerous as this video demonstrates.
Another demonstration of the danger posed by hard surfaces. Slamming the head this way can easily prive fatal or life changing.
Falls like this can easily kill or paralyse.
This is simply a failure of situational awareness. Woman attempts to put a stop to a large number of young people having a party. Any attempt here is toothless without a display of force. This woman is physically incapable of handling a single person here, let alone 100 of them. She must have had a remarkably sheltered life up to this point.
Note how the arms are tangled in clothing once the fight is on the ground, which helps one man positionaly dominate and knock out the other.