PP1-20

The hognose snake puts on an impressive bluff, hissing and rearing back, broadening the flesh behind its head the way a cobra does and feigning repeated strikes, but it has no dangerous fangs and no venom, and eventually, if its pursuer is not cowed by the performance, will fall over and play dead.

It's correct sentence but I have a question.

In this sentence, we consider that "hissing and rearing  back, broadening the flesh  behind its head the way a cobra does     and feigning  repeated strikes, "  parallel

Do we need put "and" before broadening, since "broadening the flesh  behind its head the way a cobra does and feigning  repeated strikes" is the last part of the parallel,

or put a"," before and feigning, if we consider this is the last part of the parallel?

I am really confused about the parallel here. Thanks for any help

: )