Resident Evil 4 Remake Separate Ways DLC - Unknown Test Subject Encounter

Separate Ways is a DLC for the Resident Evil 4 remake. It is first announced in PlayStation's State of Play on September 14, 2023, and released on September 21, 2023 alongside additional content update for the game's The Mercenaries minigame.

The unknown test subject is a creature you encounter in a test laboratory later in the game.
It was definitely a pretty cool encounter with the laser hallway!!!

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In 2004, Ada Wong was employed by Albert Wesker to retrieve a sample of The Amber and its research data after leaks of it broke out. She manages to reach out and form a deal with Dr. Luis Serra Navarro, one of the researchers for the Los Iluminados cult who had discovered the Amber's property and it's potential strength after being left in the Amber Storeroom for an extended period of time, and had brought it back for further testing upon coming across its peculiar shape. In exchange for the Amber sample and its research data, Ada was to extract him out of Valdelobos. However, before Luis can hold up the end of his deal, Luis and the other researchers are forcefully parasitized with Las Plagas. He manages to remove it before being fully taken under its control and flees back to the Valdelobos and hiding the Amber before being captured and thrown into the cell of Salazar Castle where he is set to be tortured and killed along with other prisoners.