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It sounds like he may have broke some blood feathers. This is not too uncommon. We used to just pull these feathers, but now they are advising against that. Now, you can just use direct pressure to stop the bleeding and some Kwik stop septic powder that is used for toenail trimming. That will allow a clot to form. Within a day or two, they're no longer sensitive. At the next molt, the new feathers will push the broken ones out.
Yes, corn starch would be fine.
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