coin toss

[yankeesfan]

can someone help me to understand why they have "defend a goal" as an option in a coin toss situation. lets say the visitors win the coin toss and elect to defend a goal, the home team will get the ball. lets say the visitors elect defense, the home team gets the ball and then the visitors get to pick what goal they want to defend. now in the second half if the home team takes offense, the visitors get to pick what goal they want to defend again. it works out the same in both situations. i believe defending the goal is no different that just saying we want defense. why have that option of defending a goal if you win the coin toss in the rules? what am i missing. i feel it is useless? maybe i am missing something. if someone can clarify for me i would appreciate it.