I feel like this kind of thing would have to be parsed really carefully to confirm.
Have someone without procs do X damage, then have tank do damage without procs until the mob turns. Subtract out the white damage and you should be left with misses. Subtract out the base damage of each weapon (do i have that right?) and you should be left with only bonus damage. Subtract out the bonus damage threat from the primary misses and you should be left with any offhand bonus threat.
Would probably need different weapon types in the primary vs. Secondary to be able to distinguish them.
Sounds like a lot of work
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