Q: "Dog performing during an outdoor dog show." Does this mean that "An animal is outside."?
A: yes

Q: "Man signs and plays his bass cello." Does this mean that "Man signs and plays his instrument."?
A: yes

Q: "A person wearing a yellow apron looking toward other people." Does this mean that "A woman is cooking in a yellow apron while watching her children sit down at the table."?
A: it is not possible to tell

Q: "A small girl is lying on the floor while her younger sister is pretending to be a nurse." Does this mean that "Two girls play with their imagination."?
A:
yes