By taking out its DoT and using your idea, that makes mark of devour nearly useless in pve
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Thorn isn't a strong PvE weapon. However this would actually make it very strong. Maybe you unload a clip of your machine gun into a fallen captain. Switch to thorn, shoot it to stop it's shields to regen and use that time to reload. The ramifications would be outstanding in the Crota fight where you can slow his shield regen.
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You could already do that with the DoT though....
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This just prevents any deaths because of dot but still keeps the regen cancel effect