Can you think of the spray that makes them dizzy and can kill you?

The spray you might be referring to is likely a form of aerosolized toxin, such as those used in chemical warfare, like nerve agents. These substances can cause severe neurological effects, including dizziness and loss of consciousness, and can be lethal in sufficient doses. Another possibility could be certain types of crowd control sprays, like pepper spray or tear gas, which can cause temporary disorientation but are generally non-lethal. However, improper use or exposure to concentrated forms can still be dangerous.