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(NECN: Alysha Palumbo, Newton, Mass.) - 18-year-old Lily Konowitz of Newton, Mass. fought off simulated attackers in a self defense class earlier this year.
Konowitz took the Rape Aggression Defense class, known as RAD, at her mother's urging just weeks before she went off to Aruba with a friend's family in April.
"Even before we went out that night I said to my friend's parents, I have us covered I took a self defense but I never thought I'd ever have to use it."
It was the next to last night of the trip.
Lily and two of her friends had gone out and Lily had gone to the bathroom.
Her friend was just outside the door, but Lily says that didn't stop an Aruban man from entering the ladies room.
"As I got up and I was ready to go, he opened the door and looked at me and punched me."
Lily was shocked, but immediately her mind wandered back to her RAD class from three weeks earlier.
"I start screaming but no one came in, no one could hear me, so I just kept pushing him and pushing him, and at the same time he kept punching me, and I kneed once, and eventually I was able to push him out the door."
Once outside the seclusion of the bathroom, Lily says the man took off -- and she ran to the safety of her friends.
She had a swollen black eye and a puffy and bruised knee... but she had survived.
"I know that if I didn't fight back he was after more, I know what he was after and I try not to think of that but I'm just really grateful that the end result wasn't what he wanted."
Now Lily and her parents are encouraging all young women to take a self defense class.
"My mom made me take the self defense class, she said you're taking it, I said fine, and I'll always be grateful that she made me take the self defense class."