Why does Clemency get interrupted? And why does Sword/Shield Oath reset combo?

[kensatsu]

the weird thing, is Tank pos swap on War is CD, and on Dark/PLD it's GCD. GCD cancel combo but
Inner beast is GCD but it don't cancel combo.
It's a weird logic. Nobody can understand why...
I think also if the PLD should be the best denfense Tank, it can be true but the difference is maybe a little too light. because against magic the defense advantage is killed.
it make actualy a good comp to be WAR/PLD against physic boss, and War/dark against magic boss