Q: "A man placing chicken on his grill." Does this mean that "A man cooks on a grill."?
A: yes

Q: "A motorcycle rider starts to sand up on the seat of his white motorcycle." Does this mean that "The white motorcycle is stopped."?
A: it is not possible to tell

Q: "lot of pigeons roaming on the street enjoying the sun." Does this mean that "the birds ran through the street"?
A: yes

Q: "A little boy is splashing around in the water in a kiddie pool." Does this mean that "A girl plays with her cat in an empty kiddie pool."?
A:
no