A Rogue moves away from an enemy creature. The enemy has an unused reaction, so it gets an Opportunity Attack — one melee attack (even if the attacker has multiattack property, mind me!). That attack enters Phase 1 (can the Rogue cast Shield?), then Phase 2 (Uncanny Dodge?), then after-damage effects (concentration check if the Rogue was concentrating on a spell). All of this happens mid-movement, before the Rogue reaches their destination.
NFA regular expressions by Russ Cox
，这一点在搜狗输入法中也有详细论述
柳波夫·希里日克（强力部门版块高级编辑）
Kyle Owen, RR Auction, Marcel, Alex1970-14, Steve Jurvetson,
Samsung The Frame Pro Television (LS03HW)