we will mount the elephants in NRA-style High Power (you might call it fullbore) target frames and they can be run up and down from the pits at random. at first only partial exposures, until finally they pop up all the way, either bull or cow, shooter doesn't know when it will occur and only has seconds like you say to shoot. Penalty for shooting the tuskless. Penalty points if you miss or wound (client gets trampled)

Poole