The brain-body will be taxed, relieved and mourning the release of the trauma the brain needs oxygen to process out the trauma.
Your mind will begin to realize as the trauma is released these negative thoughts are not accurate, and not only mourn holding on to these thoughts but you will be upset/angry you allowed yourself to hold these inaccurate thoughts for so long, because as you will realize, there was no benefit to holding or thinking about these past thoughts.
Your brain/body will continue to process and bring up the unprocessed feelings which were associated with the sports trauma, and of course ANY other trauma(s) physiological or psychological you have endured throughout your lifetime for hours, or even up to 2 days following your session. Allow and welcome the undesirable feelings. Since the entire purpose of the brainspotting process is to bring up the stored sports trauma(s)/trauma(s) so it is processed and released, you MUST surrender to and allow yourself to feel this way so the thoughts will be gone forever.