Bruno regaled the Kaiser about his journey to Russia, and his exploits to crush Marxism before it ever really had the chance to take a foothold in this world. He had in the past explained in summary his actions in the region, and, of course, Wilhelm had the means to learn the gritty details himself.
But there were certain facets of the story that were rather hard to believe, even if they came from the man himself. Let alone from third party observers. When Bruno spoke of his time in the Trenches outside Tsaritsyn, and how he had personally dealt the death blow to dozens, if not hundreds, of the Red Army's villainous scum. The Kaiser gazed at Bruno in disbelief.
Granted, the two men were halfway through a bottle of 40% alcohol by the time Bruno got to this point, and were thus sufficiently intoxicated to marvel at the story. And it was perhaps because of this the Kaiser made a rather unexpected remark, one that Bruno found slightly unnerving.