Idea for a New Smite Augmentation

I've had an idea for a 4th smite augmentation for sometime now. It just feels a bit weird to only have 3.

Basically, the idea is you would be able to smite an enemy champion (dealing no damage to that champion) but you would gain a shield based off of the smited champions max health. Number wise, i was thinking of 15% max health of the smited champion lasting 5 seconds.

Idk, just been rolling around in my head and wanted to post it just to get out of my head. lol