Andy could not back down. It would be against his cardinal rules for success: name repetition, personality mirroring, and never breaking off a handshake. (http://www.tvfanatic.com/quotes/characters/andy-bernard/page_16.html)
Also, since Billy hadn't told Andy his name in return, Andy couldn't use the name repetition, either. All that was left was the personality mirroring.
He did a creditable imitation of Billy's initial laidback delivery when he replied: "Digging those freaky quills, getting weirder all the time." And the mellow tone was hard to sustain as he kept doggedly shaking Billy's hand. "Where there's a quill, there's a need for paper," he essayed, still not letting go.
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Also, since Billy hadn't told Andy his name in return, Andy couldn't use the name repetition, either. All that was left was the personality mirroring.
He did a creditable imitation of Billy's initial laidback delivery when he replied: "Digging those freaky quills, getting weirder all the time." And the mellow tone was hard to sustain as he kept doggedly shaking Billy's hand. "Where there's a quill, there's a need for paper," he essayed, still not letting go.