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This is probably jargon, but "flow""flow" seems to describe what you mean. As in "Don't interrupt him, he's in the flow." 

Don't interrupt him, he's in the flow.

This is probably jargon, but "flow" seems to describe what you mean. As in "Don't interrupt him, he's in the flow."

This is probably jargon, but "flow" seems to describe what you mean. 

Don't interrupt him, he's in the flow.

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This is probably jargon, but "flow" seems to describe what you mean. As in "Don't interrupt him, he's in the flow."