Retro lost his cool because Taichi's attitude made him believe that Taichi had a chance of getting his card, which made him desperate enough to take the card before Taichi instead of simply defending it until he was sure. (He most likely doesn't know if there were any more "The fall" cards left).Originally Posted by Ryll
I don't think Taichi's thought process involved "If I attack aggressively, I can make Retro commit a fault because he'll be on edge". Instead, I believed it was "I have to move at every card in order to have a chance to take their side". Mashima moved before he knew which card it was because he needs to be close to the card when the 3rd syllable is pronounced.
My interpretation is that Taichi was desperate to take those cards, which forced Retro to act rashly. It wasn't as if Taichi acted desperately in order to make Retro act rashly. After reading your explanation though, I agree that he's certainly capable of such mind games.. and I'm less sure than I previously was.
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It's arguable whether or not Yumin cheats, but I was pretty put off when the coaches said Hokuo's strategy was "borderline cheating" this episode. It's legitimate strategy - period. There's nothing "borderline" about it.