i am currently building a tor client that will be able to connect to a hidden service, i just have a few questions about the RELAY_COMMAND_INTRODUCE1 cell

once a circuit is established to one of Bob's introduction point and an incorrect RELAY_COMMAND_INTRODUCE1 is sent, what, if anything would be expected back

For the PK_ ID, what information is needed for this, I have received a V2 descriptor, and see it says to use the service-key, is this the service key for the introduction point i have selected which was found by decrypting the descriptor, or permanent-key found in the non decrypted v2 descriptor