I've had to referee disagreements between East Coast USians and Germans a few times before now, mostly in terms of acting as a protocol translation layer until they were both sufficiently calmed down to underail themselves and focus on the technical side again rather than being distracted by their differing communication styles.

Generally once I'd helped them unpick that they collaborated happily and came up with something good that they both liked, it's just once people are locked in to talking past each other it's often non-trivial to break out of that.