Ok I see what your getting at better.
Your 4 entry points - Im not sure what #1 is/does, a piece doesnt do anything just by left clicking it unless it is invoking an Action Button which invokes a Key command to initiate something (or do you mean dragging)
#2 is no different than #3 that is just how you interface - it is their key command that initiates the action
#4 cannot happen without some sort of initiation previously from 1-3 above - something told it to do it 
If #4 is the cause, you need to widen the scope to find out where it came from to understand the reason why
Which of the traits are involved? I’ve d/l and will look, this requires plain old fashion detective work to figure out what is trying to be done (Need to find the original sequence description first so I know where to start)
Programming is different from Modding - which one is it your wanting to do ?
Delete vs Trigger problem. Something to consider here. A Delete trait employs an active key command, but a Trigger trait can be employed in two different ways, active (using only the key command field) or passive (using only the listen for keystroke field).
Perhaps this may be why you are seeing the Delete occur before the Trigger if the trigger is using a passive key instead of an active key.