Not inappropriate at all Hilico - and welcome to the forum.
Vortex Ring occurs when you encounter your own downwash, and can happen even if your rate of descent is not high.
It’s most likely to occur if you have (1) a low or zero forward speed when (2) descending at a medium rate and (3) a high power setting
eg a steep approach where the column of air remains underneath your helicopter. With a rate of descent matching the speed of the downwash, there is no angle of attack, the blade root stalls and thus you have no lift.
To get out of it, you reduce power and go into forward flight or autorotation, but you’ll will lose a lot of height anyway.
You avoid vortex ring by keeping forward speed while you descend, or by descending more gently.
The symptoms sound terrible (vibration, buffeting, pitching, yawing, rolling, accelerated rate of decent and temporary loss of cyclic control) but you’ll learn in training how to avoid it, how to recognise it at the incipient stage - and how to recover safely if it does happen.
(It's more like a stall in a fixed-wing, than a spin.)
[Edit]
As for the instructor who started your introduction to flying helicopters with a briefing on the dangers of vortex ring state - find a better instructor or school.
