I don't think Eric needs the reason that he didn't want to compete against his "girlfriend". Eric really doesn't need an excuse. I personally think it goes back to endurance and being physically fit. Eric does well in the power part of a challenge and in the social part of the game but when it comes to balance, agility and endurance he has a track record of quitting or not physically being able to complete that part of the challenge. It would have looked better if instead of arguing with Camilla if he said I need a break to get some air and than try one more time and then "appear" physically wiped out than to throw a hissy fit and quit like he did.