Commas

Q. Is it ever appropriate to elide a conjunction between two parts of a compound predicate and use a comma (for example, “He walked to the door, opened it.”)? I notice that many of the fiction authors I edit do this frequently.

A. In fiction weird constructions are sometimes appropriate; they should generally be tolerated until they become annoying.

[This answer relies on the 17th edition of CMOS (2017) unless otherwise noted.]