Mike sits at a table looking very nervous as he talks to Angela, who sits/who's seated across from him.
* should there be a comma after table?
* Which is more natural in the sentence: who sits/who's seated?
* Anything else?
1. ". Only one comma will not do.
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1. If you want, you can make "looking very nervous" parenthetical by placing a comma both before and after it: "Mike sits at a table, looking very nervous, as he talks to Angela ...". Only one comma will not do. I would leave it as it is, though. If you set off the phrase with commas, the sense of the sentence is damaged, because the fact that he is sitting at a table becomes otiose.
2.