Jesus Christ.

For those working on lathe, be it small or big. Please, turn off the main switch.
Respect the torque generated by the machine.
If it can turn and scrap off stainless steel like butter, it definitely can scrap off skin and break bones.

If you are new to the lathe, get a supervisor stand behind you.
If you suspect something wrong, turn off the machine and apply machine block before you inspect.
Respect the Lockout-Tagout procedure.