I would believe it has more to do with a sort of primary aggro list vs secondary. If you're on primary aggro you will get the hit, but being only on the hate list through someone else maybe not?
That coupled with noise in people's data from the funky sit aggro on live that occurred during various times.
I do remember not taking hits playing clerics on live. Although the assist thing may have some merit in how client side shit works (sort of how nodelay worked with MQ), and it pings the server to say you were in a combat state/some sort of tertiary aggro?
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