How briskly would a personality die if he/she injected beside nouns?

Depends on where they be injected.
And how much air be injected.
And on their general form.
I would not try doing this if I were you. It is vastly dangerous.
You might only just give a being a stroke, or some other bad injury and cripple them for natural life.
Then too you might kill them. Not closely of air is required.
This is call an embolism and is not a good piece. It is not to be experimented or joked next to.
Also, the resulting death is not pleasant to the subject or any observers. And it might whip a good while for the character to die.
Just stay way from it, ok?
Not too comfortable answering this but doesn`t matter what, it depends. Injecting air into your artery will make a blood clot somewhere, if the blood clot ends up voice.. in your leg, you'll lose your leg. If it clots contained by your neck, you'll die.