PHOENIX -- Two hikers were airlifted from Piestewa Peak Thursday evening after falling over a 10-foot cliff, according to the Phoenix Fire Department.Rescuers weren't immediately sure what led up to the fall but said the 18-year-old man and 17-year-old girl were hiking off trail."They're both awake and talking," said Phoenix Fire Capt. Mark Vanacore. "The male has some pretty serious shoulder injuries, and the female has some serious leg injuries from the fall."When the teenage girl was airlifted from the mountain, her basket was spinning and flailing around for about a minute.Firefighters say that sometimes happens and could have been due to rotor wash or a twist in the cable. They say it is not a safety issue.Other hikers thought the ordeal looked pretty harrowing."I can't imagine being on that line they dropped down," said Tana Fast. "They were just dangling up there, you know, going up to the helicopter."Bryce Fast said she was scared for the hikers."I couldn't imagine being in their position," she added.Both hikers were transported to a hospital by ground ambulance.