One, I would ask the clerk for advice as to whether the motion to challenge the chair is in order, given the delay between the ruling you made and the challenge—that's the first thing—and whether the motion to challenge the chair is appropriate after a lengthy intervention. I understand that the entire speaking slot should be used only to challenge the chair and not to engage in debate, so I think it is flawed on two counts.
I would ask for a ruling on that before we proceed with a vote on whether the chair's ruling should stand.