if it wasn't affected the absorb would be 10-20k, any heal dot can overheal this bullshit, just remember when they removed pvp power on necro in pwow, dk was unplayable even a shadow priest could heal through necros.
Just take a video from bajeera or any retail dk player, and watch the amount absorbed by just 1 necrotic strike on arena, then u will know without doubt if its working properly with pvp power or not, instead of reading random comments from forums.
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you are not suposed to use any pvp item in pve