VinRouge,
a single HP turbine blade has the same Kinetic energy as a 20mm round if it separates at the root. Takes a lot of containment to keep it all in, plus to keep a massively unbalanced core from shaking itself to bits, even if the FADEC catches it and commands an auto shutdown.
Did you mean
fan blade? HP turbine blades are just ahead of the LP turbine near the rear of the engine which looks rather intact and generally don't move forward when they fail as they are ground up by the LPT...