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You would do 1 damage to each enemy, then 1 damage again, and then finally 1 damage again. The 'or' in "face up or face down" should be read as 'and/or', and the damage is one at a time rather than all at once.
You get +4 attack. The 'or' in "face up or face down" should be read as 'and/or'.
No. Pounce counts only the Secret Actions in your played area.
No. The Action is 'put' into the KO area, not scrapped, thus it does not trigger Decepticon Shockwave's bot mode.
By default all characters start in the mode showing their star cost. So the minions, while not visible under Trypticon and Metroplex are in alt mode. Note that while Relentless Invasion card does provide a way for a Trypticon minion to be under Trypticon in bot mode, it will be deployed in Alt mode (per WotC FAQ).
You can play the Steamroll, however you cannot use it for Nightbird's attack as by the time Steamroll is played, Nightbird's damage was already applied and the defender was already KO'd. If you happen to attack again on that same turn, Steamroll could be usefully applied to an attacker.
No. The Hold the Line is revealed and repairs when the defending character 'defends' (126.96.36.199 of the Expanded Rules), whereas the Bold value isn't locked in until later when the Bold and Tough are calculated (188.8.131.52 of the Expanded Rules).
No. The KO trigger on the character with the Head has to wait until any subsequent War of Attritions have been played.