  We use the Heisenberg picture of Everettian quantum mechanics to work out the
relative descriptors for the Frauchiger-Renner thought experiment. While
Everettian mechanics reveals no paradox within the thought experiment, the
decoherence-free setup offers an instructive branching tree. Traditionally,
branching structures derived from the Schr\"odinger picture suggest that
foliations are always sharply defined. However, the Heisenberg picture
demonstrates that the tree contains regions with inherently non-sharp
foliations, leading to the conclusion that, in Everettian mechanics, quantum
agents possess a blurry memory. This analysis helps resolve several
misconceptions stemming from the Schr\"odinger picture.
