( Taking notes:
                                     ( David is here. His watch is 
                                     ( talking to his phone.
                                       ~~~~~~~~~~~
                                                   o
         ___                                         o  ___
        /   \                                         _|___|_
        |   |   client                                 |* *|
         \_/                                            \_/
          |     _/                                       |
         /|\   //                                       /|\
        / | \__/  ^                                    / | \
       /  |__     | Discovery                         /  |  \
      /   |\ \    v                                  /   |   \
         / \\_\                                         / \
        /   \   server                                 /   \
       /     \                                        /     \
      /       \                                      /       \
     /         \                                    /         \

        David                                        Adversary