system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Was Lucious Malfoy really going to Avada Kadavra Harry Fucking Potter outside Dumbedores office at the end of Chamber of Secrets?
gpt
Unlikely.  Lucius Malfoy's not an idiot, he would definitely know that casting any sort of curse on a Hogwarts student on the castle grounds would likely lead to a very overprotective response from Dumbledore.  Doubly so if it's Harry Potter.  It wouldn't matter if it's an Unforgivable Curse or a Tickling Hex; you simply do not come to Hogwarts and cast a spell on a student.  

So, if he would be unable to cast any spell on Harry Potter, and he probably also wouldn't get away with beating Harry over the head with his cane, then how should his impotent rage be directed?  The worst Malfoy could do against Harry would probably be to terrorize him a bit, send him running screaming back to the safety of his common room.  Thus, Malfoy bluffed the Killing Curse, with the idea being that every wizard would know and be frightened of the words *avada kedavra*.  

Joke's on him though, Harry didn't learn about the Killing Curse until two years later.