She walked in the direction that General Grady was taking her. Which is just on the other side of the car. She tipped over when she stumbled upon brick or rock that she didn't see because of the darkness. Fortunately, the driver who is just behind her catches her.
"Careful." The driver said.
This doesn't seem like an abduction. Senator Rizza thought to herself. Then she followed General Grady.
After walking to the side of the car, General Grady guided her to turn right. So she followed him. That's when she noticed that they were walking down a hidden passageway. It was hidden meticulously so that no one would notice its existence. After a few steps, they were literally walking under the forest.
She wonders how General Grady could see the way without light. Unless he has been there a couple of times and has already familiarized himself with it.