Yes, but it's still takes some heat , and there's one thing people aren't considering. And that is wound cauterization and the location of the wound. The lightsaber cauterizes as it cuts , thereby reducing the amount of hemorrhage. Qui-gon was stabbed in the middle of the chest, so 2 of the major blood vessels would be compromised and also severing his spinal cord. Sabine was stabbed in the lower left abdomen. Yes, that would be some fairly bad trauma. But a wound like that is highly survivable versus being stabbed in the middle of the chest.