Flip Effects are Triggered Effects, so if a player flipped a flip effect monster, the effect will trigger as chain link 1. Fiendish Chain can be chained to it, to negate the effect when it tries to resolve.
However, if the monster is flipped by an attack, then the trigger happens during the Damage Step. There are restrictions against what you are allowed to activate during the damage step, and Fiendish Chain can't be used here. So it could not stop a Flip Effect at that time.
The Flip Effect itself is a Trigger, an activation of a monster effect. Herald of Perfection cannot negate the summon itself, but can chain to and negate the actual Flip Effect trigger.
You cannot use Royal Command to negate and monster whose effect activates when it is flip summoned, as Royal Command only activates for FLIP: monsters.
No. A monster that is face down does not 'flip' when destroyed by a card effect, and will not trigger any flip effects.
No, but it does stop it. 'Negate' is a very specific game term, which has other meanings and significance. All Sakuretsu Armor does is make it impossible to continue the attack step by removing the attacking monster - the Damage Step will not be entered, so the defender will not flip if face-down, and no damage will be calculated. However it is still not accurate to say it 'negated' the attack, which other cards like Necro Gardna actually do.
Flip effects will activate if flipped manually by Flip Summon, or when attacked. Also must include "FLIP" in all caps for its effect to activate, or say 'when this card is turned face-up'. For example if a monster such as Guardian Sphinx is flipped face up by an attack or an effect (spell, trap or monster), the effect does not activate, because only a Flip Summon triggers it, not a generic flip. When a card effect destroys a face-down monster, the monster is destroyed and flip effect isn't activated because the monster never flips. Mystic Swordsman Lvl. 4 destroys the monster it attacks without flipping it, so a Flip Effect monster attacked by it will not get its flip effect. To summarize, if a FLIP effect monster is attacked while face down, then it will activate. But if it's destroyed by a card effect while face down then it won't activate. Some card effects let you flip monsters face up and let the flip effect activate, like book of taiyou. But others, like ceasefire don't let it activate. If it says 'when this card is flipped face up' then you have to do that manually on your own turn.
The Flip Effect itself is a Trigger, an activation of a monster effect. Herald of Perfection cannot negate the summon itself, but can chain to and negate the actual Flip Effect trigger.
This depends on the specific monster and its abilities. If a monster's summon is negated and the monster destroyed, it is likely that its effect was never able to be activated in the first place. In this case, its effect would never have applied
You cannot use Royal Command to negate and monster whose effect activates when it is flip summoned, as Royal Command only activates for FLIP: monsters.
Yes. Not only will Baou negate the Flip Effect of monsters, but it will also negate all out of play effects too. A destroyed Witch of the Black Forest will not trigger her search effect, Helpoemer's discard effect will be inactive, and a Treeborn Frog cannot be special summoned, etc.
He definitely 'can' be affected by it - only when he is Flip Summoned though, if something flipped him face-down previously. Even then, he could just chain his Quick Effect, to negate and destroy the Trap Hole. If he was face down, and a Skill Drain was active, then a Trap Hole could be used when he Flip Summons. Then he would be unable to negate it, and be destroyed.
They can, (unless the card that flipped it says "flip effects are not activated at this time.")
No. Flip Effects only activate when the card is flipped, which will happen when Flip Summoned, or when the monster is attacked, or when an effect specifically directs it to be turned face up. Simply destroying a face-down monster, or removing it from play, does not 'flip' it, so Flip Effects will not activate.
They can definitely activate them, but you can negate them. Horus Lv8 has a Quick Effect that can negate Spell Cards. If the opponent activates a Spell Card, then you can chain this negation effect to the activation. So Horus Lv8's effect will resolve and negate the Spell Card. Unless the opponent is using a card that can't be negated (Spiritualize, for example) then yes, it will prevent him from activating any spell cards. Horus Lv8 can activate this effect in the Damage Step too, so can stop effects like Shrink if used there. However to 'activate' a Spell Card means to place it directly on the field face-up or flip it face-up from being Set. If a Spell Card like 'Clock Tower Prison' was already active, Horus Lv8 is not allowed to chain his negation effect to the trigger that adds Clock Counters to it.
Yes, that's the definition of a flip, which will trigger flip effects.
Yes, that particular Quick Effect can be activated in the Damage Step.
No, it is not considered a Summon. Therefore, the effects of cards such as Golem Sentry are not activated as it requires the card to be FLIP SUMMONED. However, it is considered to be "flipped" meaning that Flip Effect Monsters' effects are activated when successfully attacked.
If the face-down monster is tributed, then no, any Flip Effects it has will not activate. Under normal conditions therefore, you should flip the monster first, allow the effect to activate/resolve, then tribute the monster for whatever. But you are out of luck if your face-down Flip Effect monster is tributed by the opponent using Soul Exchange, for example. Because it never 'Flips' (even though it goes to the graveyard face up) the effect will not activate.