I think his reasoning was Cristian because he was feeling down after the task and he said he hadn't spent much time with him, Chloe because she had said Nick had shit on her a few times, so he probibly felt guilty about that, and of course he was probibly afraid she would throw her toys out of her pram and cry, let's befair it wouldn't be the first time!! And that leaves Danny, well would any of them dare leave "shut up" out of the party? He would have stomped off and then caused a row, so Nick went for the easy way out!!