@JeremyECrawford Regarding the Blade Mastery Feat, the latter two features seem to conflict one another. If I use my reaction to assume a parrying stance and gain +1 AC for the turn, aren't I no longer able to make an Opportunity Attack?

— Sean Fletcher (@seanrfletcher) April 17, 2018

If you use your reaction on one thing, you can't use your reaction on another thing until the start of your next turn. The game often gives you choices.

Reminder: Blade Mastery and other Unearthed Arcana content that isn't in a D&D book isn't officially part of the game. #DnD https://t.co/JYVp81gA8F

— Jeremy Crawford (@JeremyECrawford) April 17, 2018