Forum:Fiendish chain vs. Flip effects

I need help with a problem i have. Me and my friend free duel alot, and of course compete, but we always have the same argument. Their are two parts.

1. If I flip a flip effect monster on my turn, like GK spy or guard or anything like that, and he flips fiendish chain, does the flip effect go through or no?

2.If he attacks INTO a flip monster, again like guard or spy, can he flip FC to negate its effect or no?

He does this all the damn time, and we never agree on it, and when i ask people at the card shop they dont know either, so ppllleeeaasee help me? DX

Sincerly,

Shadowman.