Arkhandus
First Post
It wasn't pre-emptive treachery. It was smiting a fiend, that very much needed to die. Especially for deceiving the paladin and trying to make him break his Code and fall from grace. The loose agreement that the paladin was partially involved in was invalidated when it proved to be a violation and slight against his honor as a paladin. At the very most he could have waited until the rest of the party finished helping the fiend, but he could not have continued going with them during that time. Then he would have had to slay the imp afterwards for its dishonor against him.