SWAT officers "pumped gas into the room," police told KARK. When Isadore became aware of the gas, he allegedly started shooting at the SWAT team through the window.
think about that... maybe you're in bed ... gas enters room... you have gun... you shoot window... was window open or closed? if open, how stupid are cops to think gas would matter in a ventilated room? If closed, the gun serves as the most efficient way to get ventilation... unless there was actually a cop visible to him through the window... but that is unlikely... why would a cop threaten a old man through a window when they are trying to induce respiratory failure?