[He does - but once he's got a guess for what Chouji's doing - he actually stops paying attention. It's not that he's uninterested in the technique - far from it. But... Chouji should be doing his own thing, his own way. Rin'll just review the results, which is how it ought to be. So he nods to confirm that he was paying attention up until he starts, then he just goes to mess with something on the opposite side of the kitchen - some dishes]
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