Then, by Heaven, snarled the Russian, "we will see  " But Mrs. Vandemeyer also rose to her feet, her eyes flashing.
Mrs. Vandemeyer is unable to stand on her feet. 
mnli hypothesis: Mrs. Vandemeyer is unable to stand on her feet.  premise: Then, by Heaven, snarled the Russian, "we will see  " But Mrs. Vandemeyer also rose to her feet, her eyes flashing.