Saw an example of the new ABS System downside while attending the Rangers/damnYankees game yesterday. The Rangers’ Brandon Nimmo led off the inning with a walk. The next batter worked the count to 3-2. On the next pitch Nimmo attempted to steal second, the home plate umpire called the pitch “ball four”. Nimmo, then a few feet from second base and hearing the pitch called a ball, pulled up and trotted into the base. But the catcher threw the ball to second base, where the fielder caught it and easily tagged Nimmo out. Since it was called ball four, Nimmo did not need to slide - the walk forced him safely to second case anyway. The batter dropped his bat and started toward first base.
But wait. The catcher challenged the ump’s call of a ball. ABS replay subsequently showed it was indeed a strike (ball barely touched the strike zone). Okay, so the batter is out on strikes. But what about Nimmo, who now was standing, apparently safe, on second base?
The umpires convened, talked it over briefly, and decided Nimmo was out also. Strike out, throw out double play! Or was it? Would Nimmo have slid safely into second base if the umpires convened had not called “ball four”? He stopped running and did not slide, so was easily tagged out.

As a result of ABS review overturning the “ball four”, he was called out by umpire decree.
Ken