@JeremyECrawford Wil you be able to get OA with the sentinel feat on a flying creature with the "flyby" trait?

— Bernt Bergum (@Maraxion) October 17, 2016

A Flyby creature doesn't provoke an opportunity attack when it flies out of a foe's reach. Nothing in the Sentinel feat counters that. #DnD https://t.co/1p8AQBBqvu

— Jeremy Crawford (@JeremyECrawford) October 17, 2016

@JeremyECrawford @Maraxion on that note, would a pole arm master get an OA as the flyby enters range?

— Dreadwolf (@HVargavinter) October 17, 2016

Flyby protects you when you fly out of a foe's reach, not when you fly into it. #DnD https://t.co/cBMv5Yh8Kj

— Jeremy Crawford (@JeremyECrawford) October 17, 2016