[Despite finding out the truth about Gai he still wants to keep going like he always had. This makes him even MORE determined to become Gai.
Eventually, Shu figures that the Gai from his own memories wouldn't cry and scream on the floor in agony. He picks himself up and wipes away his tears. There's something cold and unnatural about the expression Shu's wearing. He's forcing himself to be something he's not. However, Shu himself has always been a bad liar. If Gai looks close enough then he can see some tears flowing down from Shu.
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Eventually, Shu figures that the Gai from his own memories wouldn't cry and scream on the floor in agony. He picks himself up and wipes away his tears. There's something cold and unnatural about the expression Shu's wearing. He's forcing himself to be something he's not. However, Shu himself has always been a bad liar. If Gai looks close enough then he can see some tears flowing down from Shu.
He's pretending they're not there. ]