This is about the version of the scene involving G-Virus infection where William Birkin infected Ben Bertolucci. You may be looking for the version with Brian Irons as the infected, or the eponymous soundtrack.
Embryo into its cradle (tentative) is a cutscene in Resident Evil 2. This scene only plays in the Leon A, Claire B scenario upon arriving back at the B1F west hall via the ducts.
It then cuts to the Holding Cell, where Ben tells an unseen creature to stay away, only for the creature to raise its arm and forces something down his mouth, with Ben continuing to scream before collapsing and passing out, with the creature briefly walking over to stand over him, revealing it to wear pants (implying the creature had originally been human). It then pans to the creature, who's only discerning feature besides it wearing pants was that its right shoulder opened up to reveal an eyeball.
<poem> Ben: "No!" "Get... get away!"
Ben: ad lib
- This scene only plays in the Leon A scenario upon entering the area. However, a similar scene plays out in the Leon B scenario.