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

[kensatsu]

Only get the Shield Oath "off" is not better realy to swap for only 2 full combo ?
sword oat only buff the auto attack , right ?

it's right the war can buff heal so, what he loose by swaping he get it by heal before swaping again, actualy i use only bloodbath myself, buffed with berserk, i tested, i got healed for at least 10K hp in delivrance, tank to the triple felt cleave. (the synergy of the skill)

A pld can do the trick by using fight on flight, blood bath but... you will heal 3K5 to 4k5 ... it's hard to compensate the loss of defence with kill a other defence CD when you want to swap with the PLD, so i don't play pld enough atm, so i can't figure myself if i would i will raid with my pld, can i count to kill one CD+bloodbath+fight on flight to dps ?
The CD from PLD is also often long cooldown.

the OP also tell :why the pld get interupted when casting Clemency: the cast of magic in this game always get interupted by heavy damage, i don't know personaly the minimum damage a pld have to take to get interupted someone know ?