My V12 NB ran into a V12 DK in Wabba...nobody else was around. The duel begins.
I did 18000 damage (CLS count) on a DK during a duel , he had block up, absorb shield, scales, etc. Still he was 100% but was doing 0 damage. His mates came and killed me after few minutes.
If on my Templar try to do the same (blocking), I will go down after couple of seconds.
One resource will be depleted eitherway. Either Magicka (Blazing Shield use) or Stamina (Block).
The only ways to kill those people is
a) back off, hide and wait for them to start moving again.
b) have more stamina than them, spam weapon light attacks to drain their stamina, and then start the abilities spam.
c) Be sorcerer and drop some pets.