That happened to Rover about 7 years ago in a town just north of you (where Merry came from). He bit his former owner. It was a well deserved bite - the owner taunted him and wouldn't stop. The bite was deep but did not require stitches. A fang bite. The health unit was called and the house was visited. The owners were told that the cat would have to go into quarantine and that they would have to pay for the stay. After a lot of "discussion" (to put it mildly), the health unit agreed to home quarantine provided that the cat have no contact with any other members of the public for I believe it was 7 or 10 days. Rover spent his jail time in one room of the house, allowed contact with the owners only. You may have to argue a bit to get home quarantine.
You did right to have the bite checked out. It's just that the health unit has rules and protocols - even if the situation sometimes doesn't really warrant them. Shortly after that, Rover came to live with us and never once bit.
Edit: You are in a different health unit district than ours. I don't know if there are provincial guidelines regarding animal bits or if each health unit decides its own.