Whiplash

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A backlash is the feeling of a traumatic memory's emotional impact.

Usually; backlashes are felt a short period of time after a new or existing member fronts- and before they switch out or move away from the fronting space. The member that is experiencing a backlash may feel a range of dizziness, confusion, trauma-related rage (even if it's not their trauma), blurriness, and/or fatigue.

It is normal for the member to appear and for the body to become very tired afterwards, to the point of that member temporarily becomes unable to fully control front for a couple moments before being able to stabilize the controls.