When you get in one of those " should I save the saw or myself" situations, the bar suffers ( Unless you opt to save the saw, of course!).
But even so, I haven't bent a bar for a decade or so.
Apprentices usually do it once at least in their first year.
From not knowing when to pull out, as you said.
The world would be better off, if more people knew when to pull out.
Would solve the overpopulation problem, just like that!