Skirmisher blade just did 657 (33%) true damage
I don't mind getting killed, by junglers or otherwise, but I don't think a smite should be able to do 33% damage. Especially since certain junglers are really tanky and hard to get away from.
edit: The person who uses this smite gets bonus true damage for 3 seconds AND also 20% damage reduction against said target. This makes dueling impossible vs persons who don't have this smite.