At worst tie goes to the runner... Not only did they overturn the call on the field, as close as it was... even a tie, should have favored Choo being safe.
It is a win, none-the-less. No harm... but unless they use something like they use in fencing... some of these calls will still be wrong.
Speaking of which... while at A&M, I took fencing. Our coach was ranked like 8th in the country and ended up moving to DC for an attempt to make the Olympics. At the end of the season, the winner of the class tournament got to face her with the electronic vests. She scored a point on him and most of us where still waiting on her to move.