Consider a person in the state of panic. What should we do to help? When they tell you to do something, you can either do it or not. However, in this case, you should make your decision quickly. The reason for this is that they are desperate to reach a state where they are content. If you do the action commanded, then they might call down a bit. If you refuse, then you need to give a good explanation why not. Doing now will only make this situation worse.
Panicked people are very dangerous. This is because you don't know what they will do and neither do they. They are in a emotional state that blocks reasoning. This is also why it can be good to follow their instructions. When they instruct you to do something, that shows they have some reasoning. If you deny this, then they will likely enter a full panic state.
Examine the model of happiness. The person, being desperate, has made a decision on an action to reach a goal of contentment. Since he is desperate, he feels the need to reach that state as fast as possible. If he cannot, then he will turn to something that he feel can help him reach that state, even if it's stupid and dangerous.
If you refuse the command, there are a few requirements in order to prevent the increase in panic and stress. First is a continued calm presence. If you show stress, then it'll only add up. Second is a quick and accurate deduction what is needed for him to reach the state of contentment. Third is to use that info and propose an alternative path to reaching that state. If you do all of this quickly, then things should work out.
Now I'm not a professional nor psychologist. I can be completely wrong. This is based off theory and one recent event in my life. However, I think it has merit. What do you think?
N. D. Moharo