Well to be fair, it doesn’t say exit on the sign. It just says ‘you can run this way to find a white wall below this sign’ - which is technically correct.

It’s a Harry Potter emergency exit. Close your eyes and run towards it.

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Now its only an emergency exit for the Incredible Hulk.

The footprints on the floor coming out of the wall makes this look like some sort secret hidden room where you’ll find an armour upgrade or something. Run up to it and hit the use button.

Fixed it.