Ketrin awoke when somebody hand gag her.
It was not planned.
She planed to turn the table and lets Dana dominate her like in doggy style.
So when unknown guy starts to wrap her hands and legs in the same way - Ketrin generally doesn't protest.
Soon she was wrapped in the same way as Dana and leader was moved from Dana's neck to Ketrin's neck.
Then guy use Ketrin as his pet and walks along the river.
After that, he put Ketrin next to Dana and connect their gags to their taped feet.
Then he leaves these taped girls alone...