mb, I believe you have the mechanic I'm describing incorrect. 3BL is 3rd base line extended into foul territory, and 1BL is 1st base line extended into foul territory.
The defense tried the un-orthodox 6-4-5 (Short-Second-Third) tag play DP, instead of the simpler 6-4-3 (Short-Second-First) DP.
If you're 3BL, you're not in a bad position for seeing both, but if you float out 1BL and open up, you're not gonna see both no matter how cross eyed you can make yourself from outside the dirt circle of Home plate. If you can, then your potentially an example of how humans evolved from fish with your eyes on the side of your head instead of on the front.
I know, I've heard the story how a very prominent umpire/instructor met his second or third wife who was Blond, by describing the eyes in the back of his head and how he could see the number of fingers on his hand when he looked the other way.