Wait a minute, this tires the fingers."  The man called Bork halted the series of rapid passes he had been making, flexing his fingers with a grimace.
He flexed his fingers to stretch them. 
mnli hypothesis: He flexed his fingers to stretch them.  premise: Wait a minute, this tires the fingers."  The man called Bork halted the series of rapid passes he had been making, flexing his fingers with a grimace.