What will now happen is called a "replay". Answer taken from YGO! TCG Website: A replay is triggered when an attack has been declared, and then during the attack a potential attack target on the opponent's side of the field appears or disappears. A replay can also occur because the attack target is no longer a legal target during the attack. A replay causes the attack to "rewind" to the time when the attacking player chooses their attack target. The attacking player can choose to keep attacking with the monster, but choose a new attack target (including the original target, if possible & desired), or to not attack with that monster at all. Note that a replay involves the continuation of the attack or non-continuation of the attack. It does not involve a new attack. If you pay 1000 Life Points to attack with "Dark Elf", and a replay occurs, you do not have to pay again in order to continue the attack. The monster that was attacking when the replay occurred is still considered to have attacked the original target, even if you decide not to continue with attacking that target when the replay happens. It can not attack again after another of your monsters, nor can you manually change its battle position in Main Phase 2. A replay does not rewind to the beginning of the Battle Phase. So attacks by other monsters that turn which have been completed are totally unaffected by a replay.
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Assuming the defending monster is also in attack position, both monsters will be destroyed.
Your monster is destroyed if the monster you attack is in attack position, and you lose life points.
No. When a monster you control attacks a monster with a Defense higher then the Attack of your monster, you take damage equal to the difference but neither monster is destroyed. The only exception is due to card effects such as Des Kangaroo.
Lightning Vortex is non-targetting so it never really activated 'on' a specific monster, even if it's alone. If your opponent uses Lightning Vortex and you have an XYZ monster, that monster will be destroyed, as per usual, unless that particular XYZ can save itself from destruction with an effect.
SkyscraperField Spell/SPELLWhen a monster that includes "Elemental Hero" in its card name attacks, if its ATK is lower than the ATK of the attack target, increase the ATK of the attacking monster by 1000 points during damage calculation only.No, its effect does not activate. "When a monster...attacks...". This automatically tells you that it activates when your monster attacks, but does not activate if your monster is attacked.