Not much obviously but, hey, how could they know? He wasn't wearing a turban. He was dressed up as a drunk leprechaun. Geeshh, who woulda ever thought this guy might be just a tad looney and needed to be watched :-)
"The man says he is Irish, he is also drunk."
Dressed in a kilt and green hat with a handwritten sign on his chest reading “The Second Coming is Near,” Horan attacked the leader of the race, Brazil’s Vanderlei de Lima, at around the 21-mile mark. ...Even if you didn’t know that Horan had a history of interrupting major sporting events, you’d think that someone at the race might have suspected that the guy in the leprechaun costume with a Star of David on his leg and a message about the end of the world plastered to him just might have been planning to do something when the leading runners and the TV cameras hove into sight. ...(Crooked Timber)