If you’re lucky, it should restart into Recovery Assistant. Otherwise advice on how to manage a boot loop or freeze, and how to disable 3rd party kernel extensions.
DRA
We’re running out of panaceas. Resetting NVRAM and SMC, repairing permissions, installing the Combo updater. or re-installing macOS, are vanishing fast. Is Recovery Assistant the new panacea?
An enhancement to Recovery intended to fix Macs that don’t start up correctly. Also available in Recovery mode.
The Eclectic Light Company 