Again (for the seventh time now) -
@Iry posits that a creature (lacking Skulker but already hidden in darkness further away) does not automatically reveal themselves when entering a dimly lit hallway (a hallway a second creature
that is not distracted and is intently staring down), with the first creature being able to walk down that hallway
under direct observation, and touch the second creature on the nose, unless the second creature makes a Perception check.
Barring some special rule such a thing is (RAW) impossible. The RAW states that when you come out of hiding and approach a creature it sees you, unless (DMs call) it is 'distracted', which the second creature, is not.
The creature looking down the hallway instantly notices a man shaped form emerging from the darkness, and into the dimly lit hallway.