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It does look like it went all at once, but that doesn't affect my comment - it could have been bent in a crash and straightened out. On the other hand, it might just be a piece of junk to start with. What's the make, model, year of manufacture? Have you owned it from new? How much do you weigh?
But seriously, don't answer. Shit breaks, you didn't die, it's not worth spending time trying to figure it out. Just get some BL-R770s and live happily ever after.
If it breaks clean in its first crash, it's safe because you're not going to use it again. The ones you have to worry about are where it doesn't break in the crash but is weakened in some way so it breaks when the service load exceeds the remaining strength, which usually means an emergency braking situation.