Mistress Morgan controls every inch of Her slave's body, that includes when he is allowed to breathe.  Mistress uses Her dirty bare feet to trample and stand on the slave's throat. Taking his breath away in many various ways but mainly uses Her feet to crush his oesophagus. Squeezing every breath out of his lungs with full-weight stomps to his chest, Mistress Morgan then pushes Her barefoot into his throat, making the slave breathless with Her barefeet.