on
public Unit onStoppedUsing(ItemStack staffStack, World world, LivingEntity user, Integer remainingUseTicks)(source)
Called on both the client and the server by Minecraft, when an entity stops using the staff before being used for maxUseTime. If that time is reached, finishUsing will be called.
Parameters
staff
The item stack used to perform the action
world
The world the user is in
user
The entity, which used the staff
remaining
The number of ticks left until reaching maxUseTime