Quote Originally Posted by leogobsin View Post
A16 This probably depends on whether you're playing on a grid on or not. If you are, then movement happens a square at a time. BB #2 hits before she's moved into the new square, overriding BB #1 before it has a chance to deal damage. If you're playing without a grid, movement happens a foot at a time, so Foe could move away from you a measurable distance before leaving your reach, triggering BB #1, and then you hit with BB #2 just before she leaves your reach, at which point she could choose to stop moving, having triggered BB #1 but not #2.
I'm not thrilled with interpretation which varies with whether you're on a grid or not, but I see that BB says "If the target willingly moves...it immediately takes 1d8 thunder damage" whereas OA triggers "when a hostile creature that you can see moves out of your reach". So I think your "without a grid" answer applies to "with a grid" too.