While walking through the crowded mall area, she saw a youth pushing his way through the crowd in what appeared to be an attempt to escape from a man in a dark-blue uniform, who was following him.

At that time, Gretel was standing near the exit from the building. When the youth finally broke through the crowd and attempted to leave the building, she stepped in front of him to block his path. The youth collided with Gretel, and the two parties fell to the floor.

Gretel seized the fallen youth by the arm as he attempted to stand up and tried to pull him back down to the floor. The youth then struck Gretel a blow on the side of the head with his fist, causing her to lose consciousness. The youth, as it turned out, was hurrying through the crowd in an attempt to catch a bus, and the older man, who was following him through the crowd, was his father. The youth's father was employed as a security guard at the shopping centre and was leaving work for the day.

Explain this incident in terms of tort law and tort liability.