Yeah, I believe it was a hotfix shortly after 2.1 that ensured Hallowed could only affect damage already intended for you.
What would be truly overpowered is if you were to receive only what damage passes through the other tank, or even just if Intervention applied its damage reduction first. Not recommending that, but it is an interesting thought.
For now Cover just allows the OT to be shielded instead as to forgo Shield Oath for either tank in fights where the tankbuster occurs every 60 seconds or more, such as Susano. OT Shelltrons, MT Interventions. Sense.
