The chime from the woman on the bench's' phone was too coincidental not to notice. It was almost immediately after he had accepted the challenge. On top of that, she turned and looked at him with a mischievous grin.

A notification popped up:

You have been summoned. Follow the arrow, kneel in front of the summoner, and say: "Thank you for putting me in my place."

Oliver looked up. They were the only two people in the park. She knew it was him and she chose the humiliation. He looked back at his phone, and it had turned into an arrow pointing directly at her. He looked back up and...