I suggest you go for a separate summary for each.
Umbrella man brings about a more rational approach, giving credit to the skills of the trickster. Dusk on the other hand doesn't show as much professionalism by the trickster(since he lacked a soap) and more critical analysation on the part of Gortsby since he was quick enough to counter-question him(asking him to produce the soap).
Thus go for two separate summaries ...
Nonetheless, good question.