This one always causes arguments.
Point 1 -> Activating Threatening Roar in response to an attack won't do anything, it affects attack declarations.
Point 2 -> The turn player can't enter the battle phase unless the opponent agrees to it. An opponent will want to use Threatening Roar at the end of the main phase, before the battle phase is entered. Many players don't announce the change of phase, and this is normally ok as they must still accept the opponent can say they wanted to use something in the previous phase.
Despite Point 1, the opponent should not be penalised if the turn player didn't give them a chance to activate the Threatening Roar, by skipping from the main phase straight into an attack declaration.
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no
Yes, as long as the spell card is a Quickplay Spell, and the trap card is not a Counter Trap. So you cannot chain Monster Reborn to any trap. Nor can you chain Book of Moon to a Counter Trap, for example.
The following monsters inflict damage to your opponent when destroyed. Some of these effects will depend on whether you or your opponent destroyed it and/or if it was destroyed in battle or by a card effect:AbakiEarthbound Immortal Aslla piscuBalloon LizardMecha-Dog MarronOxygeddon
It will be hard to say but the best thing to do is look on youtube for the answer. That way you can see what to activate and summon etc.
No. It is an Ignition Effect, meaning you may only activate Snipe Hunter's effect during your turn.