There is such a thing as "resonance" which can cause even the strongest materials to break when they hit certain materials at the right angle, speed, and temperature. I've seen case-hardened knives shatter when dropped from arm's length-heighth. On the other hand- i've seen crap knives survive falling a xcouple thousand feet from an aircraft and hitting concrete.
Basically, resonance is an acoustical response that creates sounds waves trhat can be intense enough to shatter steel and stone. The sound waves can create vibrations that literally shake the atoms loose in an object, changing it's chemical structure. Or, it coulda just been a bad batch of tempering. Or a fake.
Certainly, the "steel" inside that pommel-threading looks strangely like plastic....
I'm very curious to see what Chris@SOG says when/if he gets it.