Even if Diggle and Oliver weren't available, not one person had enough sense to request ARGUS agents, or just anyone that can provide protection, to stand watch outside the loft?. Felicity and Noah lost valuable time, a matter of seconds, in the last episode when Murmur made his way into the security data center and caused them to lose the nuke that eventually hit Havenrock. Protecting the very people who are responsible for saving the world should have been top priority, not saving Thea.