Moody said the slippery slope was due to killing, not due to casting the curse, and Harry still killed the troll.
Harry also kills chickens, cows, and whatever was in that chili they serve at Mary’s Room and more. To Harry a troll isn’t people. Killing it won’t break his soul.
Harry also kills chickens, cows, and whatever was in that chili they serve at Mary’s Room and more. To Harry a troll isn’t people. Killing it won’t break his soul.