That takes care of the officers. Not knowing where to shoot and having no place to go but out the back of the truck, only a few toss themselves clear while the rest are seared by lasers burning through the canvas- which looks rather neat, leaving little burnt holes and causing lots of screaming from unseen victims- leaving the truck as yours. Trax gets it moving and nobody contests the lizard with the turret... except Mr. Big, who has gotten out of the saloon and is firing off his concussion rifle at the escaping speeder.
Rianna, meanwhile, is starting to feel faint as the burning sensation becomes unbearable.
A good roll sees to it that Dak remains oddly merciful... and as the landspeeder starts racing away, Rianna slips into unconsciousness and one of the Two Towers, the one that is burning, suddenly pitches sideways and smashes into the building next to it. The bridges buckle and snap, spilling anyone on them downwards. This doesn't include the Shepherds, though; the leader got them out of there.