W-W-M-D? Ask yourself, What would Macgyver do? LoL
Well I guess even Macgyver himself would leave a big brown stain on his undies if that happened to him! Lol ;D
If that was me writing that errrrr Hollywood Blockbuster?I would think maybe a bring-back of the rubber slug. How about this:
Jesse gets the rubber slug, sharpens the tip of it and attaches a rope to end of the rubber bullet(Maybe the rope could be the elevator cord/rope, the metal wire thing that holds it up). He then ties the end of the rope to SH, fires the rubber slug into another building which in turn Fires SH off the 3rd floor and to safety, or another rooftop.
Basically the modified rubber slug acts like one of those Batman-esque grappling hooks with a motor to hoist him up to the top off a building.