I thought the exact same thing until I saw multilpe translations. In Cnets translations and every translation Fujitora says that meanwhile Sabo has the inner monologue in his headUhhhh Sabo was the one saying Tora isn't being serious
10-11
Fujitora: Mouko!!!
[TN: “Raging Tiger”]
Sabo: !!! // (Horizontal gravity?!!)
Fujitora: Very good!! // I’d be disappointed if you didn’t do this much!!
Sabo: !! // (What is this man plotting?!!!)
Fujitora: Hnghhh!!!
Sabo: !
Fujitora: For good or for ill... / I’m prepared to put my own head on the line. // ...If I lose my dice before I roll ‘em... / ...it’ll all be over before the game’s begun.
Sabo: ?!
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The line is different in almost every translation but regardless Fuji says it