It is the student's responsibility to discover which techniques and strategies work best for him. That translates into testing a technique you believe to be of value in a realistic full-contact environment. The important thing is to not dwell on the lie. Be thankful that you have become aware of it and adjust your training to what you now know is real. Perceive the truth.
Perception is everything in life and in the martial arts.
Make your perceptions as total in nature as you can. Gather as many facts as possible on the subject or situation before forming a perception. Experience the truth. When you discover what you perceive to be a truth, put that truth to the test. In most cases, that means putting on the protective gear and going full contact in as realistic a scenario as you can come up with.