Hellbound
Merchant of Doom
That plate you see is a connector plate. See the large beam it's attached to? Imagine another beam that size on top. It was attached to the other half of that steel plate.
The upper portion of the beam was pushed to one side or another by the weight of the upper portions collapsing. That caused the sttel beam above to act as a lever, and more than capable of shearing that steel plate off (likely through extension/stretching) without bending it excessively.
The "white" you're seeing could be a number of things. First, that looks more like silver...places where the interior steel of the plate is exposed (as would be expected from a rough seperation, as in a tear/shear event). Even assuming it's something on the plate, it would not be unreasonable to assume that some of the massive amounts of falling debris could have caused it (such as a piece of drywall impacting and depositing bits of plater on the rough edges of the torn plate).
The upper portion of the beam was pushed to one side or another by the weight of the upper portions collapsing. That caused the sttel beam above to act as a lever, and more than capable of shearing that steel plate off (likely through extension/stretching) without bending it excessively.
The "white" you're seeing could be a number of things. First, that looks more like silver...places where the interior steel of the plate is exposed (as would be expected from a rough seperation, as in a tear/shear event). Even assuming it's something on the plate, it would not be unreasonable to assume that some of the massive amounts of falling debris could have caused it (such as a piece of drywall impacting and depositing bits of plater on the rough edges of the torn plate).