For better or worse, you always have a choice. That is your control. Not choosing is a choice. You give up your control when someone makes that choice for you, and you still have to accept responsibility for the consequences.
If I can control my own emotions when someone wants me to lose my temper I am calmer and more in control of myself and my own reactions. I don't have to react to bullshit because he would like me to. I control me.