Mine has fed while blue with no second thoughts. I have heard mixed reactions from boa folk about feeding in shed. Some say no and some say go.
With boas, and the fact that most captive boas are overfed, a food break is just fine. Nothing bad will happen if it skips, and the hissing may be a sign it wants to be left alone. Shedding takes energy and so does digestion so if you do feed in shed, you may want to bump the temp up a bit as some bodily functions are occurring simultaneously.
I now use the shed process for a good "cleaning out" period. I let my fella shed, then wait a day and him dump all his waste and then the next day it's go time!
Don't be worried, and I'd just wait it out at this point.
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