Kyler Bourgeous brought Kayleigh Davis to the same trail at a state park in Utah with plans to watch the sunset.
But when Ms Davis ran a little ahead, she ended up alone with a bison who charged and flipped her into the air.
She sustained a broken ankle from the goring and a leg wound. In the earlier attack he had suffered a cracked rib and collapsed lung.
Ms Davis has a cast on her right ankle and received stitches for the wound in her left thigh. She was released from hospital on Monday.
The attack happened on an established trail in Antelope Island State Park.
Witnesses reported seeing a bison strike Ms Davis with its head, "lifting her off the ground".
The 22-year-old was airlifted to hospital in Ogden, Utah.
