Why does he lean against the wall?

I wished him a happy birthday when passing him in the hallway and his eyes just got big and he didn’t say anything. After we passed each other I looked back and he was walking with his body pressed against the wall. Another time in passing and talking he did the same thing. I only asked cause it’s almost moviesque with how dramatic it looks. Or could he just be comfortable doing that?
Why does he lean against the wall?
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