Elusive and massive thief
What associations does the word "thief" evoke in you? It will certainly be some small, thin, inconspicuous little man who can easily hide in the crowd. Forget the stereotypes, there are thieves in the heavyweight division too. Such dimensions can be very useful. This large lady stole clothes from the store and did not give the police a chance to catch her. For such a person, special forces are needed.
