Back in alpha if I challenged a person in proving round and after say waiting 20 sec with no response or if they shortly after did a AI match I could cancel challenge.

After set two and still on test server you can not cancel a challenge and have to wait the full 90 seconds locked out from doing anything. This is got to be the most aggravating annoying thing in this game. Please for the love of God give us back the option to cancel a challenge.