Lahei only blocked the communication between the other party and you, and his actions against you were blocked. At this time, you are still his good friend, but because of the "abnormal relationship", you can only exist among his strangers.
When he is not surfing the Internet on his home computer, the next time he logs in, you will disappear from his stranger. This also requires the response time of Tencent system, which sometimes lags behind. If you want to put it in a group outside the blacklist from a stranger, it is equivalent to the verification process of adding this friend again.