Observer-dependent black hole interior from operator collision

We present concrete construction of interior operators for a black hole which is perturbed by an infalling observer. The independent from the initial states while dependent only on quantum state has natural interpretation perspective boundary operator's growth, resulting collision between accounting and outgoing modes. partner modes are created once observer measures mode, suggesting that dependent. Implications our results various conceptual puzzles, including firewall puzzle, Marolf-Wall information problem, discussed. Explicit counterarguments against $\mathrm{ER}=\mathrm{EPR}$ approach Maldacena Susskind also presented.