About ur last question, if this monster battles a monster with 1600 atk or higher this monster is destroyed as a result of battle and the opponent's monster is destroyed by the effect of this card at the end of the damage calculation. None off the players take battle damage.
If this monster battles a monster like spirit reaper, that monster is destroy after damage calculation by the effect of this card.
The card is really good, I see it teched in some ocg hero beat deck lists.