For that taunt, assist off of the target.

#show
<Insert Assist Here>
/cast [help][help, Target=TargetTarget] Taunt Spell

Whoever the bad guy is targeting, has the most threat.



Different abilities with variable cooldowns would be the reason for "click" with a Ret Paladin.
Unless you have a long enough sequence which you can indefinitely loop...
A prot uses a 96969 sequence, because everything is instant and everything is refreshed before it is cast again.

Even with instants, click gets you a priority.
We have:
- Consecration, every 8 seconds.
- Judgement, every 8 seconds.
- Crusader Strike, every 6 seconds.
- Divine Storm, every 10 seconds.