Setting: The universe stops expanding and the arrow of time reverses, but unevenly, like a wave on a shore both advancing and receding.
Conversation
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there is an arrow of computation, or rather, an actual present state, and time supervenes via perspective of computed observers
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all observers must be computers; time is what change of environment looks like to them
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hmm: since you bring up perception, it the arrow of perceived time not always aligned to the psychological/computational one?
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even if that what is 'outside' has a decreasing entropy arrow rather than an increasing one
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but ofc assuming a human observer running opposite a decreasing universe is silly: its substrate still follows physics
it would have to be a shell that works in decreasing entropy but still supports a human mind (possible according to some)