Would an E9 comply if ordered to attention by an O1?

I had a similar thing happen to me but it was a cadet trying to get me to go to attention and salute her while in airborne school and in the training area no less oh and I had already received my wings while she was still waiting to start training don't know if the story warrants further mentioning as this question is in reference to O-1's calling out E-9's.

Yes, and then rip his ass in private

The little butter bars better ready themselves for an ass beating!

In the late 70's I saw a CPT tell the division CSM to come to attention as the CSM was chewing on his 1SG after having the MP's called to their company Christmas party three times. It didn't end well for the CPT.

The O-1 is still an officer, so the E-9 would be compelled to obey his order. One thing I learned in the Navy is that you respect and salute the uniform, not necessarily the person wearing said uniform. Were junior enlisted to see the E-9 disregarding the O-1's order(s), a bad example would be set. Were this not to happen in front of other military members, a different outcome would most likely occur, but the O-1 is still an officer and the E-9 is still enlisted, so respect should still be rendered to the uniform, if nothing else.

That would be career suicide for the O-1, and would be commented on in his fitness report with great prejudice. However, I have always advised newly commissioned and junior officers that they are in charge and ultimately responsible. More than one officer has had his career ruined by not holding senior enlisted, including the E-9s, accountable, and when something goes wrong on your watch because of a drunk, an abusive individual, a dishonest or thieving individual, or a sexual harasser, make no mistake about it, the CO is going to hang you too. Do not be afraid to pull senior enlisted aside and give them clear expectations when you see something going on that you know isn't right. And do not EVER neglect your responsibility to document an individual's shortcomings in a performance evaluation.

I was a Corpsman (E3). One night working in the Medical Surgical ward, I had a patient began to come, VT. So I yelled to my nurse to call the code and I would rush the crash cart to the Bed Side. Of course LTJG bla Bla got upset and tried to put me in my place also claiming my patient was DNR. I repeatedly told him he was in fact NOT A DNR (do not resuscitate) so I told him to check his nursing notes and meet me at the bedside when he is ready to save his patients life. Needless to say he almost got sent to the record department for not responding correctly. Point being watch each other's backs both enlisted and officer alike. Yes we answer to officers but we have so much to offer as enlisted.

Had a 2d LT lock our 1SG up for something stupid.

2d LT spent the next few hours in the commander's office after he caught wind of it. Came out soaked in sweat.
Play stupid games, win stupid prizes.

In front of the troops, yes. He has to set the example.

But the instant it's no longer in front of junior enlisteds and VERY junior NCOs, poor butter bar's going to get his shinies all corroded by the language he's gonna hear...and if he goes running to the railroad tracks or bird...well, when he's done blushing over being laughed out of the CO's office, he'll have got the point.

Slap the butter bar right in his face !