Q: "A group of more than 8 is speaking into microphones." Does this mean that "A group of people are talking into microphones."?
A: yes

Q: "The little girl is playing with her shoes off." Does this mean that "A little girl is not wearing her shoes."?
A: yes

Q: "A group of people are running in a race." Does this mean that "Marathon runners run in a pack."?
A: it is not possible to tell

Q: "A pitbull dog is biting another dog on the face." Does this mean that "A pitbull kills another dog for trying to steal his food."?
A:
it is not possible to tell