Stanford Financial founder, Allen Stanford, is being held for swindling $7 billion from investors. Vijay tried to put up $500,000. as bail for Stanford. The federal magistrate, however, refused to allow Vijay to post the bail because he's not a U.S. citizen.
Stanford Financial was a sponsor of Vijay's for several years, an endorsement deal worth $8 million. According to a USA Today article, Vijay wants to help, since Stanford has only been charged and not yet found guilty. It's obvious a friendship existed given Stanford's company sponsored Vijay on the PGA Tour.
As a token of that friendship, Vijay tried to help. Half a million dollars is probably not much money to Vijay. Good for him for sticking up for a friend.