Q: "A black dog is stepping on the ice." Does this mean that "A dog walks on ice."?
A: yes

Q: "Two boys riding their dirt bikes in the mud." Does this mean that "The boys are riding bikes."?
A: yes

Q: "A child with a skull on his shirt is sitting in front of some plants and a building and is holding onto handlebars." Does this mean that "A kid is sitting and holding handlebars."?
A: yes

Q: "A person is riding their bike through a wooded area." Does this mean that "The man is on an expensive bike."?
A:
it is not possible to tell