Wow, I totally missed that section the first time around. Thanks.
On that subject - how would you account for the swooping attacks of a flier, like a wyvern? When it attacks from the air, is it considered engaged at Arms Length, and therefore has to Retreat to fly away again? That doesn’t feel right, and against a group, would put it in a situation where it could be hit multiple times from other opponents before its initiative came around again (ie, treating it exactly as though it was on the ground, locked in combat). Most games have some provision for such a “fly through charge” attack from a hard-to-hit flying opponent. Anything in the rules about that?