Q: "A young man prepares some hamburgers on a grill in the backyard." Does this mean that "The man is sitting on his sofa."?
A: no

Q: "Old man riding a bike down the street." Does this mean that "The bike is larger than a truck."?
A: no

Q: "Two people are on the side of a glass building." Does this mean that "Two people are on the side of a building outdoors."?
A: yes

Q: "One person in the foreground and two in the background kiteboarding on a calm day with mountains in the background." Does this mean that "A group of people are on vacation kite boarding."?
A:
it is not possible to tell