Arrancar means many things, but I think the primary meaning is to pull something out (e.g. to pull weeds out of the ground, to rip someone's beating heart from their ribcage, etc). I suspect that it means start by way of old engines which were started by pulling a cord, but that's only a guess and I have no evidence.
So in short, yes, your interpretation gets the sense correct.
PS there was not a sigh would be better rendered there was not a sigh left. Quedar here is remain.
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