@Sadurian,
The rules of 5th edition as far as I know is that Halfling are able to move through creatures or character who are 1 size larger than them. A human is large, a halfling is small. Therefore a halfling can move through any large creature.
The question is then if attacks of opportunity will be triggered here. If it would, then the feature is pretty useless and people wouldn't use it, but if not, then rogue halfling have it easy getting backstabs by simply moving through the enemy.
I've never played DnD, so I'm no expert at all, I'm just saying that it sounded from the players handbook like Halflings could do that, and BG3 is based on DnD 5th edition.
