Well, we set some rulings. The committee agreed to the 24-hour rule. I'm saying that it's not a subamendment; it's an amendment. I'm only following the rules the committee gave me to direct. That's what I'm trying to do.
I have ruled that it's not a subamendment. It is an amendment. So you're right, you have four choices: you could not proceed with it, you could ask for unanimous consent, you could give 24 hours' notice, and finally, you could challenge the chair.