In an interview with Amanda Madison and Joshua Sizemore from their jail cells, they didn't deny tossing the rocks, but said they never thought it would hurt anyone.
"I didn't think it could kill somebody," Sizemore said. "I wasn't aiming for death."
Madison said the night began innocently enough.
"The main reason I wanted to go to the bridge was to have the adrenaline pumping through my body -- like having (a very short distance) between a semi running underneath your feet," she said.
Sizemore said after a while, Madison wanted to play a stripping game where if they saw a headlight out, they would say "Sex Me" and the other person had to remove an article of clothing.
He said the game continued for about 30 minutes, "until (Madison) started getting bored and went and grabbed some rocks. We continued our game and every once in a while, dropped a couple of rocks. I heard banging, said '(expletive) this,' got up to go and 'boof!' there's some cops."
The pair were tracked down by troopers on the ground with assistance from a State Patrol airplane, which captured video of the couple throwing rocks.
Troopers say when they caught up with the pair, it was apparent that Madison was losing the game -- she was arrested in just her underwear. Sizemore says he was shirtless and was without shoes.
He added he didn't think tossing rocks was so dangerous.
"I didn't think it was deadly, I thought we were just hitting roofs and stuff," he said.
Madison wanted to make it clear that it was all her idea, and that she was sorry for what she did.
"I didn't expect just kicking it and having fun and sitting on a bridge watching cars go by, waving at them to turn into throwing rocks," she said, tearfully. "I wanted to throw rocks so we went and got rocks. It was my idea and we picked up the rocks and started throwing them. I was aiming -- I was throwing at cars left and right. I never meant to hurt anybody. None of the incident people should have gone through that.
"I never meant to hurt them, none of them, but I did. I just wish I could go back and change everything I've done and instead of throwing rocks and just feel the breeze. I don't know why I decided to start throwing rocks. All I can blame is myself. Those people shouldn't have been hit and I shouldn't have been dumb enough to do it."
Sizemore was similarly apologetic.
"I wish I could go back in time and change everything. I wish I could tell them I'm sorry and have them believe I only wished to have a little fun with Amanda and that was all, I didn't mean for rocks to be involved."
The two have pleaded not guilty to 14 counts of second-degree assault. If convicted, they could face a maximum penalty of 10 years in jail.
"It was just a dumb little prank I did," Madison said. "It's not funny at all. Fourteen people got injured because of me and it shouldn't have been that way."
Sizemore is being held on $40,000 bail, while Madison is being held on $50,000. But from her cell Wednesday, Madison said she doesn't want to be bailed out.
"What I did was awful," she said. "I actually deserve to be in here. All the innocent people I ended up hitting with rocks, if you do the crime you have to do the time - that's the way I look at it."
Sizemore said he too, wants to atone for his actions.
"I don't want leniency, I just want people to understand I didn't mean to hurt anybody," he said.
Madison added she just turned 18 last month and had been living on her own since November, but now plans to return home when released.