Please read above post regarding blood in droppings. No need to separate birds as they have all been exposed. Yes,intestinal lining is stringy and can look like blood,but it does not kill.What your seeing in their poop might not be blood at all. My chickens and many others have had a little redness in their poop but in fact this is not even close to blood, it's simply some bug, plant or something they ate. You might want to take a closer look at the droppings. If they were all getting infected then wouldn't there be bloody droppings in all of the them? I'm really not sure about your situation. You should tell him to separate his birds from the ones you sold him just incase.
OP does not know if there was ever any blood in droppings.
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