The final step in the test is the most stressful—literally. During the final phase of testing, the tester will place the tip of the blade in a vise, and bend it to a 90 degree angle, sometimes using a pipe for leverage. This tests the strength of the metal and the apprentice’s ability to heat treat it, giving the blade a harder edge and springier back. If the stress on the blade causes it to chip, shatter, or snap, the apprentice fails. A slight bit of cracking is allowed, but this is a slim margin for error.
No matter the outcome, the knife is ruined.