Blood coming from the feeder's nose after thawing doesn't bother me. There are a lot of membranes and things that don't thaw well and bleed. I've had super-squishy feeders not have any problems and ones that look fine burst into blood and guts when coiled, there's no definitive way to tell. Buy from a reputable place, keep them frozen until time to thaw, and there's no real reason you should have a 'blowout', but they do happen from time to time.
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