So.. I fully understand the concept of melee engagement, and I like it a lot. What I'm not quite clear on is why it has been implemented NOT with the traditional "attack-of-opportunity" implementation, but instead a "cannot leave without special abilities" implementation. Is there some reason for this? I sort of understand the mechanical reason for it (allowing frontliners to CC enemies) but I'm not clear on the rationale... if you're fighting with someone, nothing's stopping you from running away except the fact that you'll be turning your back on them (hence the traditional "attack-of-opportunity").