On page 22, there's a translation error. Renchan is term for when the dealer repeats (often translated to "bonus round" or something like that). The consequence they're going for there is that since there's no tobi (the game doesn't end when someone goes below 0 points), it will continue until South 4, but with renchan it's South 1-2 so she's stuck in hell for even longer.
Page 5, hanchan is technically half game yeah, but it's the standard length so people don't really refer to it as such. It's just a game or match or whatever.
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