Suggest Treatment For Sudden Memory Loss
The memory loss appears to be occurring due to dissociative amnesia.
Detailed Answer:
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I can understand your concern. If we consider type of memory loss then most of individuals loose memory gradually and memory of day to day events is lost progressively while remote memory remain preserved. Such type of memory loss is seen with advancing age related decline or with Alzheimer's disease. In traumatic cases sudden memory loss is seen that is for the events immediately preceding and following the trauma.
The type of memory loss your friend is showing can't be explained by any of common organic memory loss. But some times in dissociative memory loss or dissociative amnesia memory loss is limited to a specific event only and individuals retain normal memory prior to that episode and following episode. As you have mentioned he has no signs like slurred voice, weakness of limbs etc. So we are left with dissociative amnesia as his provisional diagnosis. This is not a neurological problem. In extreme stress individuals may develop such symptoms. In most cases spontaneous recovery seen and nothing is needed to done. If the symptoms persist and recur then visit a psychiatrist for his treatment.
Thanks, Hope this helps you. Please don't hesitate to ask again for more doubts.