Feature length is feature length.
Is what it is.
Typically, 90 pages is considered light, anything over 110 pages a wee fat.
@ <85 pages this script's
waaaaay under industry standards.
Rather than cheat and trick consider some more actual story.
Action films are often slammed for having two dimentional characters.
Consider introducing some more actions, dialog, and relationships that introduce the reader/viewer to a world greater than a protagonist's/antagonist's immediate concern.
Next, deliberately complicate a process to acquire or achieve a goal.
Instead of a simple phone call consider the protag must meet someone who knows someone that deepens the spectrum of the environment everyone is immersed in.
In the film "Heat" Al Pacino's character doesn't just learn about "Slick" from a data base search.
No. First he hears it from the opening sequence's TV man, then he roughs up a snitch, then he has to go meet the snitch's cousin who drags in about a competitor concern.
It ain't simple.
Instead of a foot race that becomes a car chase consider the protag in a foot race to a hostage situation to successful/tragic outcome to an improvised weapon fight to location/building search to a car chase to water rescue.
In "Mission: Impossible II" Tom Cruise's character doesn't just go steal the rabbit's foot from a briefcase or a UPS truck. Nope. He's gotta get his team to a foreign country, scale a building, get to another building, slide down the glass, break in, shoot out, get the RF, escape, run around on the street.
It ain't simple.
The important part is to be mindful of your act structure and expand proportionately, avoiding a dysfunctional flow of timing.