I'm afraid the above post is true, though my Roselia would not be KO'd before launching the attack (Pain split pulled through, healing me 25HP; I fainted through energy exhaustion). The only thing that should be rereffed is the fact my Beldum made a blonde move of using Quick Guard early, and A2 should go as follows:
Bandit: Leech Seed (Christine)
Mecha: Iron Head (Christine)
Hope this clears something up for the both of you (Was keeping my mouth shut because it was better for you).