Q: "A man talking on a cellphone passes by a billboard stating, "Never Sleep Again."" Does this mean that "A billboard proclaims "Never Sleep Again" as a man on his phone walks by."?
A: yes

Q: "Two men are having a conversation in front of a souvenir shop in Rome." Does this mean that "In front of a souvenir shop in rome, two men having a conversation"?
A: yes

Q: "A mountain biker does a trick on a forest path." Does this mean that "a biker on a forest path for the first time"?
A: it is not possible to tell

Q: "A crowd of people look at something out of frame, one man takes a picture." Does this mean that "A man takes a picture."?
A:
yes