"[It] is more what you'd call 'guidelines' than actual rules"
Alignment is now how the character is perceived by the majority of people of the world... I still think alignment should be what the majority of your own people think of you though...
In this case, he is ONLY a good guy, good guys are allowed to ambush people, play dirty tricks, sand in the eyes, whatever... as long as they are doing things for the greater good of the world...
Lawful Good guys would most likely have a form of conflict they stick to, IE call out the name of his opponent before approaching, make sure both combatants have weapons, only fight on even ground so there is no unfair advantage, whatever... this is the reason people hate playing lawful good for the most part and is also the reason they got the nickname "Lawful Stupid" around where I live.

(btw, I love playing LG, its more fun and challenging)
So, your guy who basically ambushed 5 slavers... that was a good act, not a "lawful" good act though... but who said anything about laws? lol, he may be a robin hood type and do a lot of ambushing
