It sounds like someone’s medication over-reacted and they became disruptive on the flight. You are correct...the airline is being very quiet over what the passenger did to cause this.
One Brit witness did comment that this was a woman, and she was jumping over seats and yelling at passengers....scaring them to a great extent. The witness also said the crew did try to sedate the woman, and it had absolutely no reaction on the woman.
The airline had the passengers picked up at the airport and taken to a local hotel, and would restart the flight after crew-rest.
They were halfway there. Last I heard zip-ties were in fashion. She would be raving regardless of which direction they went.