If the catcher throws to 3rd base after faking to 2nd, the pitcher must break to the plate to back it up in case of a rundown.
As the catcher receives the ball, the LF must back up any throw to 3rd and help out in a rundown.
Backs up any throw to the 2nd baseman in the baseline, then proceeds to 1st as a back-up in a rundown.
In the ensuing rundown, the defenders have to keep alert for a signal from the 3rd baseman.
Backs up any throw to 3rd, and is ready to get involved on any rundown between 3rd and the plate.
If a rundown occurs, the pitcher must back up the man at 1st.
If a rundown occurs between 3rd and the plate, the pitcher must back up the plate.
If it isn't, he throws to the pitcher's glove (at shoulder height), then stays alert for a possible rundown or a play at the plate.
Stays alert for a rundown situation either between 1st and 2nd or 3rd and the plate.