 FACT: The collar magnets, high powered as they were, should have  either attracted or repelled each other from the beginning. After  Gordon hits Wests collar with the rock, Wests collar "reverses"  polarity, causing it to attract to Gordons. However, if there was a  complete reversal as is implied, Gordon and Wests collars should  have repelled each other from the beginning. Therefore, Gordon and  West should never have been able to jump into each others arms, let  alone stand next to each other in the small perimeter afforded them  when they first woke with the collars.