1. Dragon Knight he runs into around 3:50 doesnt use Scales until he is at 35% hp. DK uses scales at 3:58 and that sorc goes from full HP to 50%hp over the next 4 seconds damaging himself. Then at 4
He played well while the others played very badly (as always in these videos) but you are right, he kept the Scales up for around 80% of that time while attacking and that's too much.
If crushing shock / force pulse count as one projectile for reflective scale, they must also count as one attack for crit surge. If not, that is some extreme bias for DKs.