Kickback

If an untethered creature Strikes with a tech weapon that uses ammunition or petrol while floating in zero gravity , they Push Off from the target of the attack 5 feet plus 5 feet for every damage die of the weapon. If using Auto-Fire or Area Fire, they're Pushed Off in the exact opposite direction as the center of the cone or burst. Spells that use Strikes or target all creatures in a cone or line and deal bludgeoning, fire, piercing, or slashing damage causes an untethered spellcaster to Push Off 5 feet for every damage die of the spell.