Lifting Strength to tear a steel and bulletproof glass security door from steel reinforcing in a wall

[VersusJunkie54]

I have two questions when it comes to some possible Halo LS feats I have no idea how to calc nor quantify. First we have this.

John waited on the other side of the steel and bulletproof-glass security door, one hand on its handle, one foot braced against the wall.
Inside three muffled thumps sounded.
John pulled, wrenching the door and frame from the steel reinforcing in the wall.

- Halo The Fall of Reach

And also this, ripping a Human in half which I did not see on our common feats page.

We’ve installed neural-inhibitor collars on you and your comrades. UNSC standard issue for dangerous felons.” He smiled. “I’d wager without one you could, and would, rip me in half in that miraculous power armor.”
John kept his mouth shut.
“Relax,” the man said. “I am General Graves.”

- Halo Oblivion