Additional security mechanisms like drones could have been essential equipment for the situation, Christopher Ragone, who runs Executive Security Concepts, a US security firm, told the BBC.
The BBC has not been able to verify if a drone was present at the Kirk event. Experts have also said it is unlikely a drone was present.
A drone would have provided the vantage point to see the rooftops that surrounded the open-air event, Mr Ragone said.
With no standard for security events for personalities like Kirk, it is up to the individuals and their budget, he said.