Seems like the shielding is doing its job -- what might have happened
if the event had occurred in a region WITHOUT shielding?
An impact will make a hole rather than a dent, unless the object which
impacted is in a very similar orbit (which would happen pretty much if
and only if it was released from ISS itself).
My first guess is that the "dent" is the result of the shielding
undergoing some kind of thermal expansion/contraction. Maybe someone
with more expertise would have a different first guess.
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