Oh, thank you, I see that now. I thought that part falls under the umbrella of the initial condition...
if ((RightSwitchVal == HIGH) && (currentMillis - RightSwitchMillis > interval/2) && (currentMillis - SlowFlashMillis > interval/10))
...but I see now how it is all separated. How would I include the secondary if's and operations under the control of that initial condition? I have it formatted with indentation the way I thought it would have work, but obviously that isn't happening. I'll read up on how to do that.
Onward!