Hans Gruber is portrayed as being highly intelligent and organized. In most situations throughout Die Hard, he is calm and in control. The attack on Nakatomi Plaza was obviously meticulously planned.
When Hans Gruber is looking for Mr. Takagi to interrogate him, he calmly walks around the room giving somewhat of a mini-biography of Takagi's life:
Where is Mr Takagi? Joseph Yashinobo Takagi,... ..born Kyoto, Family emigrated to San Pedro, California, 1939,... ..interned at Manzanar, 1942 to '43,... ..scholarship student, University of California,... ..1955. Law degree, Stanford, 1962. MBA, Harvard, 1970. President, Nakatomi Trading. Vice Chairman, Nakatomi Investment Group... Enough. And father... ..of five.
Hans Gruber knows pretty much everything about Mr. Takagi before he arrived at Nakatomi Plaza. Why didn't he know what Mr. Takagi looked like? Is there any evidence that Hans Gruber did know what Mr. Takagi looked like and he was just implementing some sort of scare tactic by doing this?