Cut Bevels On Manual Lathe?

[Wreck™Wreck]

that is exactly what i noticed some time ago when i saw that video
his tailstock quil is lifting, it is not just the center drill moving

He failed to tighten the quill lock lever/bolt on an unstable tailstock, much like forgetting to tighten the way lock levers on a manual mill, things will move around.

I did not watch the video but from the description this is what experience tells me is happening.