passing it to his friend while he doused the light.

I found this a little confusing. It sounded to me like Ellis was dousing the light that Anderson Created, which might be what you were going for, or it might not.

the visible pleasure (Herr Blauberg) of others

Like twirlynoodle, I think the parentheses should go after others if used, but my personal preference would be for it to just say Herr Blauberg instead of others.

I do adore Jack and Sir William's interactions. :D