Question about killing an elephant

Theoretically, since we are delving into imbrobabilities, I could use a slingshot to blind it, making it rampage almost randomly. This wouldn't be the ideal modus operandi, but at least I wouldn't be in as much danger. Hopefully, such a tactic would force the beast to run away from me. Since the discussion requires me to solve the problem by killing the elephant, this idea is useless.

If I were in a large city, I might be able to lift a manhole cover, assuming I could open one quickly, and the elephant might trip. Again, this wouldn't kill it, so I'll move on.

If I were near a vet's clinic or hospital I might be able to find some tranquilizing stuff, but the likelihood of using it successfully is slim.

I'll settle on this:

There happens to be a military show in town on the same day the elephant decides to charge at me. As it's charging, I hop in a tank (loaded for a demonstration) without anyone noticing. The crowd and military men notice the rampaging elephant and begin taking action themselves. Then, I fire multiple shots from tank, hoping just to strike the creature once. The animal ends up dead and I end up in serious legal trouble.

Jam it back in, in the dark.