I don't use mine in tanking macros, but I've seen this happen a few times with my DK/Ret paly team. After I use word of glory to heal, I'll spam my normal DPS keys for a few seconds, then hit another button which attempts a crusader strike on all the palys. If any of the macro's was stuck on Templar's Verdict waiting for holy power, then the crusader strike will generate the HP and allow it to move forward.