Begin a battle between the two Units specified by this effect and perform the damage step. Do not perform the attack step, block step, or action step at this time. Like a normal battle, the Units deal damage to each other, and after resolving all triggered effects you advance to the battle end step before returning to the main phase.

Yes, it does. Effects that activate during battle apart from effects like 【Attack】 and "When [...] attacks" activate even during battles initiated by effects.

Yes, it does.

No. If there are four or more enemy Units in play, you are forced to activate this effect up to and including the portion "look at the top 5 cards of your deck." Whether or not you add eligible cards among them to your hand is your choice.

No. You are forced to activate this effect up to and including the portion "Look at the top 5 cards of your deck." Whether or not you add eligible cards among them to your hand is your choice.

No, it does not.

No, you do not.

Yes, it does.