Yes, I thought the same thing. This is an interesting take on it quoted from the article above.

Houston Police Chief Troy Finner said authorities have “heard rumors of people injecting people with drugs” at the show, but added “I think it’s very important that none of us speculate.”

A source close to concert organizers told The Post they believe that is what happened, pointing to a spate of “spiking” incidents at UK bars and clubs as an example of the sort of attack, and suggesting that the people who collapsed were all in the same area of the crowd.

“This was a targeted attack on innocent people, including a child,” the source maintained. “People were being spiked against their own will. The crowd surge was from panic because people were running for safety.”