Various parameters are typically passed to a RAD Application when it is called. The $L.args variable represents a list of arguments passed to the us.notify RAD Application (Parameter Name: names). This means $L.args can and does change based on the scenario/work-flow.
In the case of updating an Incident, 1 in $L.args represents the list of operators in the Assignment Group specified within the ticket.
If you are saying for an update scenario, 1 in $L.args is list of memembers of an assignment group. Where do we check this code? Where is this setting happening?