Those Terrible Engines of War Will Wait.

Kalfman and wildegan theorized that when van go came near gogan on the street, shouting and waving a razor, gogan attacked with the sword. The two agreed to an unspoken code of silence. Another piece of potential evidence is they write these weird hint hint sort of things to each other. For example, after van got is sufficiently recovered he writes to gogan that he'll shortly be returning his left behind fencing equipment.