I'd say that since you can one shot atheon using a norfleet, and just throw on a sham shield to ignore 97% of all the bullets fired at you. A single vault hunter is worth tons if guardians. That's not including iron gods, vermiverous, terramorphus, and all the other invincibles.
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The Templars sheild is invincible to everything unless it's The Relic.
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You can walk under the shield.
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But you still can't damage the Templar.
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They could just pick up the relic. Also The Templar still can't leave the vault.