@MarsOmega, I did forget to say “Under the circumstance, you did fine!”
This is me continuing to yell at clouds … your local league needs to recognize playing games with one umpire is NOT the answer to an umpire shortage. Just as @elares said, “enforcing the penalty is the solution”. The league needs to cancel a few games due not having two umpires. I bet your league finds a few more umpires after that.
Also, just as you point out that fall ball should be a time to have fun and be less competitive, it is a GREAT time to start training and working in new umpires.
As umpires, we need to stop continuing to play along with “the answer is just to use fewer umpires.”