Why even bother casting this stuff? Paladin tank in 5 mans is OP, get some spell damage and frisbee/JoR the 1st target and Consecrate+SoR will hold the rest. Don't waste mana generating extra threat that you don't need. It's easy to run the math based on TPS, DPS and mob HP... to find out exactly how much of a threat lead you need to hold aggro. Maybe if you get a string of crits + LO procs on the 1st or 2nd target you can lose aggro, but that's what taunt/stun/BoP is for!