It is a relatively standard policy for companies to tell workers not to touch anyone who has a medical emergency. It's a huge liability for them if they do. Like it or not, if you touch someone who has a medical emergency and they experience complications or die from your efforts, you could be sued for a lot of money and possibly go to prison.
The implication is that since it was lunch time in a hospital cafe, you'd think a trained medical professional would be around to help, but the story makes no distinction that this was the case.
What I am more surprised at is that no one had the presence of mind to contact the hospital, who could have sent medical professionals next door to help in just 4 minutes.