a deja vu kinda thing that happened to me last year

so it was a day that i was waiting for my friend to come out from my school's library, i was sitting outside on a bench

then i saw another girl coming out of it

it'd be the most common thing ever if it wasn't for me just witnessing the exact SAME girl coming out of it abt 20 seconds later

she was literally the same, like the same backpack half falling off her shoulder, her clothing, her physical aspects, the way she'd take, her walking, even her head's movements between her phone and the surroundings were identical to the other girl i just saw

and also: no, there's no way anyone could enter there by taking the way she took after getting out, especially in such a short time

my friend obviously thought i was baiting and til this day, everyone i tell that thinks im joking on them (or probably crazy lmao) but i swear to God i saw it

and i know it was a deja vu thing BUT STILL wtf is the explanation for that dude