I agree they’re warning signs that you are awake and a good anaesthetist should pick up on it but, I am also saying that it’s possible, rare, but possible given the nature of GA to not have enough anaesthetic onboard while having a decent does of muscle relaxant. So you can look like you’re out of it from the end of the bed but still be aware. A good anaesthetist should honestly be paying attention to the patients physiology and noticing the blood pressure and heart rate spiking before this happens though. Maybe evening using something like a BIS to help confirm anaesthesia.