Her chains!

"The guy who contracted me to do this had a great idea for you. Now try not to struggle too much...or I'll make these tighter."

The man pulls out a bunch of metal- what seems to be a collar, some shackles and chains connecting them.

He adjusts April's bondage, freeing her arms.

Scared and unsure, she doesn't fight back as he pulls her hands behind her back and locks them in the metal shackles.

The other end is connecting to a metal collar, which he places around the nude woman's neck.

He removes the rest of the rope, but keeps a hold on the chains.

"There are many kinds of bitches out here. You are now what we call a Runner.
Pretty self-explanatory, really.
You run. Guys chase you.
When- not if- you are caught, they have their fun. Got it?"
April nervously nods.

What else can she do?!?

"Now run free before I take my turn."

He lets go and she does indeed run off.

She doesn't realize how noisy the metal chains are.
She doesn't know that there's an App that lets people track them (via chips in the collars).

He loves his job.