/stopcasting
/cancelaura Blessing of Protection
/cancelaura Divine Shield
/cast Divine Shield

I use /stopcasting in most of my instant-cast macros. It's very important before Lay on Hands for example.

Oh, and don't forget the utility of /startattack on seal, judgment, and consecration macros.
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Armory // On-Hiatus

Only those who will risk going too far can ssibly find out how far one can go.
If you aren't in over your head, how do you know how tall you are?