A Web Swing Needs an Anchor
A swing is not simply a forward leap with a web animation attached. The web has to connect Spider-Man to a point in the world. Once it is taut, that connection redirects his movement into an arc: he falls and travels around the anchor instead of continuing in a straight line.
In this game, a building supplies that anchor. The game must recognize a suitable spot on its modeled city geometry for the web to attach. If there is no building overhead, there is no point for the line to hold, so the swing cannot begin.
The City Is Part of the Mechanic
That makes the skyline more than scenery. Buildings determine where Spider-Man can build momentum, how long a swing can last, and where he must release or find another attachment point. A gap in the city can interrupt the rhythm of travel, even when the character still has forward speed.
The rule also shapes how players read the environment: height and distance matter, but so does having something within reach above the route. The web does not create support out of empty air; the city provides the structure that makes swinging possible.
