The "MUTE" function should automatically trigger the target's "MUTE" back to you.
Basically, a mutual "MUTE" - we could call it "NUKE".
That way, even if they can see your posts by not logging in under that account, they can't leave comments as that account and they can't downvote you as that account. And if they want to move their stake to another account, they can wait 13 weeks, just to get hit with another "MUTE".