WH, this sounds like typical panic behaviour on his part.

They just can't cope.

It gets too much to deal with, though, after so long, I know.

There is a limit to how much nuttiness and nastiness one person can take.

Try not to let it get you down.

My L has said that he believes that my XH will not stop or settle until he is ordered by a judge.
In other words, he is the sort of person who will not agree to anything that comes from me or my L.

Yours sounds the same.
They will keep going and going until they get slapped down by authority.