Can't boot into emergency mode to perform lvresize

[cen]

Hi

I want to decrease the size of my home partition and increase the root 
partition using lvresize. if I understand correctly, I should boot into 
emergency mode so home is not mounted. I followed the documentation, 
adding systemd.unit=emergency.target to linux16 entry but system just 
slowly loads and freezes at fedora logo. I left it for a few minutes, 
nothing happens.

Best regards, cen