The Queen Leech is observing Billy Coen and Rebecca Chambers' progress through the mansion, and proceeds to gloat that they're wasting their time as he is "very territorial" of the training school before laughing cruelly. It then cuts to a row of cages, one of which opens where an Eliminator escapes.
QUEEN LEECH: You are wasting your time.
I have already claimed this place for myself, which means you are trespassing, and I am very territorial.
- Resident Evil Zero HD Remaster, Gallery.