Pesach

Why does it say in Davar Achar "alu eser makkos shehavi hakadosh Baruch hu al hamitzrim bimitzraim..." (these are the 10 makkos that Hashem brought on the Egyptians in Egypt...)? Of course the Egyptians are in Egypt! If its excluding the ones that aren't currently in Egypt than why shouldn't the ones that just left be punished for what they did? Also, if that's true, why didn't the other Egyptians just leave for a little bit until the makkos are done (we find the bechorim got into a major war with their fathers right before makkas bechoros that caused even more deaths than the makkah itself. Why not just take a quick vacation in Eretz Kena'an or something)?