Uhm, unless my info is wrong, the e-brake is separate from the calipers. Either way, do explain how it stopped with the e-brake when the iPhones were completely destroyed.
W... T... F...
I mean, he makes up a dopey story about why you would do this.
Just say "fuck it, we felt like doing this!"
The e-brake on 4-wheel disc systems is generally a drum brake setup on the rear that uses the inner part of the rotor as the drum. That is why the e-brake was still functional.