A couple of the the check-points I use with my DD and the other catchers I work with is the height of their head and the ability to touch the ground with their mitt. It doesn't matter which stance, the top of the head is very close to the same distance above the ground. In a runners-on stance, the stance widens, the hips raise, and the torso flattens to maintain the same head and shoulder height. If the head, shoulders, and torso raise, the ability to effectively catch a low pitch (not in the dirt) is compromised significantly, the umpire has to adjust their view, and the pitcher is presented with a very different look.
Using the top of the bat rack as a reference, we can see that height of the helmet doesn't vary a whole lot between stances.
Sign-giving...
No Runners...
Runners-On...
Using the top of the bat rack as a reference, we can see that height of the helmet doesn't vary a whole lot between stances.
Sign-giving...
No Runners...
Runners-On...
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