Weird "To start android, enter your password" screen when booting up

I was planning to flash twrp on my mi 5 but while in fastboot (i didnt flash anything i was just about to) i remembered i forgot to put SuperSU in internal storage So i kept the power button pressed to boot into miui but instead i got this weird screen. Its a weird screen with a weird keyboard which i have never seen before. i didnt even had a password (had pattern) nd my mi account password doesnt work. So now i cant access my phone

Attachment 3794965

Im on miui 6.5.3.0 global dev (latest) and BL is unlocked

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