That's right! Defenders should get an exotic armor piece that grants armor lock at the cost of melee energy.
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I like this idea, I'm just considered about how OP it would be. Hear me out. Your melee charge takes twice as long to charge up, but when it is charged, you can activate armor lock, which lasts 3 seconds and can block a nova bomb, FoH, golden gun, etc. also, if you get hit by an enemy melee, the armor lock protects you from it, and the enemy wastes their melee, and when the armor lock runs out you can easily kill the enemy (unless they have a shotgun).