Huh, at least for me, I'd draw a line between distinguishing his two personas and treating them as different people - that's not at all the same thing.
And the Envoy's reactions are different from Shen Wei's too, a lot of the time, and his priorities
The Envoy's and Professor Shen's, yes, but Shen Wei is the whole person; he's the Envoy as much as the professor. (Sometimes people imply that Professor Shen is more who Shen Wei "really" is and the Envoy is just a role, but that's not what you mean, is it?)
He wants Shen Wei to meet him in the middle, right?
Yes, true. He doesn't want to trap Shen Wei; he wants Shen Wei to confide in him.
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And the Envoy's reactions are different from Shen Wei's too, a lot of the time, and his priorities
The Envoy's and Professor Shen's, yes, but Shen Wei is the whole person; he's the Envoy as much as the professor. (Sometimes people imply that Professor Shen is more who Shen Wei "really" is and the Envoy is just a role, but that's not what you mean, is it?)
He wants Shen Wei to meet him in the middle, right?
Yes, true. He doesn't want to trap Shen Wei; he wants Shen Wei to confide in him.