Slumdog millionaire scene*SPOILER*?

spoiler alert so dont get mad if you dont want to know what happens!! when salim and jamal are running from the men killing people, they see a boy in blue carrying the arrow, which is how he got that question on who wants to be a millionaire. how did they see the blue kid/how did he know it was the bow and... show more spoiler alert so dont get mad if you dont want to know what happens!!

when salim and jamal are running from the men killing people, they see a boy in blue carrying the arrow, which is how he got that question on who wants to be a millionaire.
how did they see the blue kid/how did he know it was the bow and arrow if it was a figment of their imagination??

im so confused please help!
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