While you're inside a mindscape, barring certain circumstances, you're not aware of anything done to your body. Would you persist in the mindscape if your unconscious body were killed? Obviously you die once you leave said mindscape in that circumstance, but performing actions beyond your death has consequences to considre.
I would expect the mindscape rules to mention if you persisted there past bodily death, and they don't. Doesn't explicitly say you go away immediately, though, so if you want to invoke the rule of cool, you have leeway.