This thread is trivialising a massive security shortcoming, namely that - despite the fact that hand luggage is flagged as requiring a secondary inspection due to explosive residues - a passenger can retrieve that item, disappear into the crowd
I fly regularly through T2 at MUC and I can completely understand how this happened.
When the guys at security decide to do an explosive residues test on part of your hand luggage, they explain this in German (did this passenger actually speak German and understand what they said to him??) you simply stand around by the x-ray belt/table with all the other passengers collecting their screened luggage. You're even allowed to repack the laptop/camera/whatever into your hand baggage. There is no "area" you are led off to, they don't move your item(s) to a different part of the belt/table - so especially if you don't speak (perfect) German of course there's a risk you think screening is finished.