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It wasn't a retcon They had been setting this up for several seasons
now, perhaps since Agent Lundy died in season four but deffinately at
the during the Lumen arc in season 5 when at the end in the season
finale "The Big One" Debra actually catch Dexter and Lumen disposing
of a body, but their identities were blocked by a opaque plastic sheet
so she didn't know who they were. She told them she understood what
they did and why they did it and told them to leave before the police
got there in an hour.
In season six she said she felt nothing for killing a man in a
shootout in self defense. That isn' normal even when it is totally
justified (although most TV cop shows depict it as being so with the
protagonist not feeling any psychological effects about taking a human
life) so they have been setting things up for this for at least two
maybe three seasons. It is not out of the blue.
As for Debra ordering a hit specifically, in fact Dexter maybe feeling
a bit of deja vu. Harry Morgan ordered Dexter to kill a pimp, Juan
Rinez who killed prostitutes when he was released because of a faulty
search warrant. Dexter did and he proudly showed Morgan the pimp's cut
up body. Morgaan ran out of the room to vomit. A couple of days later
Morgan realized what he had done commited suicide.
This time around Debra is doing the same thing Harry did for the same
reason, out of a sense of outrage to get justice done. Of course it is
also the fact she was starting to have feelings for the murdered
author.
>
>Is this Dexter's first poisoner?
----
No its not. In fact his very first victim was a poisoner, an Angel of
Death.
In a season one flashback Dexter killed one of Harry's nurses (he had
a heart attack) Nurse Mary when it was found out that she was
poisoning him with morphine. Harry gave him permission to do it. She
was his first victim.
Then there was in season two Jimmy Sensio, a Vodoo priest who served
his victims ricin laced drinks, but Dexter let him go.
------>Hunter
"No man in the wrong can stand up against
a fellow that's in the right and keeps on acomin'."
-----William J. McDonald
Captain, Texas Rangers from 1891 to 1907