First off, this apparent "miracle" that the mysterious Sikh man
performed is nothing special. A random man from a large shopping
circle like New Delhi is probably a random theft. Knowing thieves,
they're very clever and quick. The Sikh which is probably another
thief who just happen to steal this American's wallet. Within the
wallet theres likely to be a picture of the American's family and
pictures usually have some kind of writing on the back stating when it
was taken, where it was taken, and who was in it. After looking at
these information, the Sikh man, in an attempt to earn some more
money, offers the American $10 in order for him to tell the american
the names of his sister and his mother.

Secondly, out of personal experience, a apparent foreigner in a
country will most likely to be the prime target for scammers. I've
been back to Vietnam once ever since I came here in 1993. When I went
back there to visit, people were trying to scam me for my money left
and right. Being from another country, you dress different, you talk
different, and what makes you the prime target for scams is; you don't
know much of the surrounding society-- gullible in other words. I
recall this one time when I went out to buy a vietnamese sandwich from
this cart on the streets. Its an wierd Vietnamese thing to not post a
menu with prices or anything, they expect the customers to know the
regular going price. Not knowing anything about the regular prices, I
purchased a sandwich and when the cashier told me the price I was a
bit skeptical. I can't recall what the exact price was or how much the
person tried to scam from me. Fortunately, I went with a cousin, whom
I was staying with, come with me and she was able to set the price
straight otherwise that cashier would've gotten away with a junk of my
money.