That reminds me of one of my first addons back in the old Burning Crusade days when I was mage tanking Krosh Firehand. Wrote an addon to track the shield buff on him so I could steal it rofl.
I also did one more recently ( several expansions back ) where I watched for power shield on my priest. Or something similar.
Neither addon would work now ( if I still had the code somewhere ) unfortunately but could be a good starting point.
I'll monitor the post to see if you get any joy.
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