Since it was not Hazel that they had kidnapped, it meant that Joshua and Hazel were aware of their plan and deliberately set them up. Fred was afraid that Joshua had followed them and would hurt them.
Mandy was not stupid, but she was so angry that she could not think straight. She was thankful that Fred reminded her of the repercussions of the situation.
As they rushed to escape, Fred stopped to start a fire, hoping it would confuse everyone long enough for them to get away. Joshua was quick, though, and they did not get far before he forced them off the road.
"What should we do?" Mandy was flustered. Looking out the car window, she began to tremble visibly.
Fred's face was pale. He was only a businessman and was definitely not good at plotting kidnappings and murders.