Q: "A rock climber ascends." Does this mean that "There is a person cleaning the house."?
A: no

Q: "A crowd is watching a performance in a dark venue, and one man is taking a photo." Does this mean that "The performance is being photographed."?
A: yes

Q: "A young kid is standing up on the merry-go-round." Does this mean that "A child standing."?
A: yes

Q: "A person is rock climbing." Does this mean that "Someone is climbing on a rock."?
A:
yes