@LaVaine,

I can do some of my own testing later to try and figure out exactly how this will behave / how it should be configured as this is right up my alley.

For the record, Scenes are just preset lighting and device status - while a Smart Action is an automation that operates in a sequence and has triggers available.

I think that your best path forward to configure automation such as this is to create multiple smart actions:

-  Actions to Turn on the Lights / Group when Motion is Detected from the Camera

-  A separate action with the lights as a trigger when they turn on, which turns off the lights after a delay. 

- Alternatively, set another smart action based on the cameras motion detection that will turn the lights off after a delay, this would prevent the automation from firing when manually turning on the light

Speaking with our Product Testing Team, I am under the impression that the Smart Actions operate as a single automation in most cases, meaning that any triggers received while the automation is running would not restart the automation; for this reason, it may be better to separate out the automation into multiple steps so that multiple Smart Actions can be running simultaenously.