Are you thinking of when a monster declares an attack, then the opponent activates something like "
Enemy Controller" to switch the attacking monster to defense, then the attacker chains "
Zero Gravity" to "
Enemy Controller"?
In that scenario, the "
Zero Gravity" would resolve 1st, switching the attacking monster to defense, then "
Enemy Controller" would resolve switching it back to attack position. In this scenario the attack would still go through as normal since the monster did the 'quick' attack, defense, attack switch all in one swoop.
For Roninlord's example, he's saying the "
Gemini Elf" attacks, the attack resolves, then after the attack he activates "BoM" to flip "Gemini" face-down (resolves), then activates "
Ceasefire" to flip it back up (resolves), then activates "
Zero Gravity" to put it back into attack position (resolves). It's a different scenario since it's not all happening at one time.
I would say the monster could attack since it was flipped face down by "BoM".
Just my $.02!