What @Simply_Fiction said.
We've already seen this Spider monster summon an army of other smaller spiders to eat the other girl and the forensics lab guy.
If the entire city isn't covered in giant skyscraper webs by the end of this story I will be disappointed.
All the spider sex jokes aside, this is a legitimately excellent horror story. Gives me heavy Lovecraft vibes. Some mysterious creature in possession of some scientist escapes and eats a person, partially merging with it together somehow. Has a bunch of supernatural powers and feeds on blood. This ain't no Saya no Uta but by god it's trying.