Here is the Fred's idea of a double switch.
Situation:
Bottom 8
#6 Slot - Luis Gonzalez RF - walks
#7 Slot - Treanor - SAC 1-3, Gonzalez to 2b, 1 out
#8 Slot - Amezaga, started in CF but now at 3B Ks, 2 out
#9 Slot - Carroll PH for Tankersley P, Ks, 3 out
So, who do you pull and where do you put the P in the batting order? Why, you obviously keep Carroll in the game, replacing Gonzalez in RF, and move the P up to the #6 slot!
Now, in the 9th, the Marlins go down 1-2-3, leaving the #4 slot to come up in the bottom of the 10th? So, what do you do in the top of the 10th? Do you keep your new pitcher in the 6 slot, and then just PH him in the bottom of the inning? No, of course not! Don't be a moron! You put the pitcher in the #3 slot so you can get your #1 CF out of the game, and in the #6 slot put a guy in at 3B who's never played the position before in his pro career, take out your #1 defensive CF, replacing him with your #1 defensive 3B and #3 defensive CF. So, defensively, you have your starting 3B now playing 1B for the 9th time in his entire pro career, your 3B playing that position for the first time in his career, your #3 CF in the game, in RF you have you #6 fielding OF thanks to your 8th inning fiasco, and your best two OF out of the game due to you being the Mother of All Wonder Dummies. Your LF is your only decent fielding OF in the game, and you have Ramirez and Uggla up the middle. It is the worst imaginable defense. As a result, Schneider of all people, and with a sore hammy, gets and infield base hit.