Kramer is the ranking officer in command of the Schloss Adler, a true Nazi with ice water in his veins. After killing Sergeant Hartmann, "Johann Schmidt" reveals that he is in fact John Smith, and that pretending to be a Nazi spy questioning the loyalties of fellow turncoats Thomas, Christiansen and Berkeley was the quickest way to get them to write down the names of all the other German agents in England, ostensibly as a means of proving themselves.
Kramer is shocked and enraged.
Suddenly, Major von Hapen enters and everything goes downhill from there. Reverting to Johann Schmidt mode again, Smith feeds von Hapen some nonsense about a plot to assassinate Adolf Hitler, which he swallows, hook, line and sinker, sufficiently distracting him enough for Schaffer to whip out his silenced Walther PPK and blow the Gestapo officer away.
The dining room promptly turns into a shooting gallery.
Von Hapen hasn't even hit the floor before Kramer acts. Even though the dead Hartmann and his slung MP40 are lying mere feet away, Kramer doesn't move to grab the weapon, instead choosing to grab his private phone to summon help, but the quick-thinking Schaffer whirls and fires, hitting the unprepared Nazi in the back. Kramer drops the phone and falls out of his chair, quite dead. A rather sudden and frankly dull demise for one of the film's principal Nazi villains.