Of which, you've now used your defensive cooldown and won't be able to use it when you need it.
I think again, it's not so much lobbying, it's confusion as the intent of certain spells.
Unending Resolve is far more attractive to actually get a cast out and so the fact it reduces damage by 40% (making it's cooldown as long as it is) is overlooked completely, it being so hard to get casts off without it.
When I arena, albeit it's openly stated 2v2 isn't balanced, I play with a holy paladin... Our tactic vs pretty much every single comp comprises of the following:
Run around for 3 minutes building embers with fel flame, pop darksoul, trinket and unending resolve, go for chaosbolt.
If it succeeds, great!
If not, repeat the process, going for the kill every 3 minutes, while doing pretty much nothing for the rest of the engagement.