Interesting about the bandaid. Could be some other unusual marker like a big tattoo (fake), bandanna, facial hair, etc.
Yes, some huge glaring trait that would get all the attention during the very brief encounter.
So the question I would have is why him? I mean the German man who was killed. What are the facts about him? What did he do? What did he know? What was his position, station in life? Who did he know?