This was the third knife into the quench using McMaster Carr 9 second oil pre-heated to 120 degrees, using a limiter plate and going in tip first. The first two blades had a consistent and uninterrupted quench line. This blade however came out strangely, with what appears to be an additional quench line with a corresponding transition zone behind the quench line that runs out to the edge. The quenchant was around 130+ by the time this blade was done; other than that the process was the same as usual. I was certain I had even and consistent color along the blade edge prior to quenching as well. I believe this blade must be heat treated again. Any thoughts?