My friends and I played a game where
Metroplex had Six-Gun deployed in alt mode. The defending player had a tapped character with 1 health left and an untapped, undamaged character. Metroplex converted into bot mode and attacked the character, and Six-Gun's ability KO’d the defending character. Does Metroplex still flip battle cards to see if it can use the bot mode ability or does the death of the tapped character mean the attack stops?
[Source: WotC] 
No,
Metroplex does not flip battle cards in this scenario.
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