Question: Guard+Parry

Now i was thinking if an sacrificed lk with parry on and the sader/pally/RG has guard on which transfers to the lk too will the parry =50% chance parry and then the remaining get bloceked by guard too =30% we can get this two possibilities:
*If guard is before parry
100%-30%=70% now -50% of that 70% = 35% chance to be hit by an attack
*if parry is before guard
100%-50%=50% now -30% from that 50% = 35% of chance to get hit so there is no difference (actually done the math in the same time i was writing this thread)
Now if the combo would be possible this could be the best tank ever so RK parry with like 60k hp(know that an RK could have more but its an possible to all maxHP) and and pure sac RG with like 60-70 k hp ,could be the gerates tank even better in terms of surviability to an tank MS sura
ALL WAYS if the combo is possible cuz i don't know if parry stacks with guard but technically it can since they are 2different skills made by 2 different classes.
PLZ help me with this question cuz it could be very useful to kill MVPs in early stages wen no sura is avaible and i know some RGs and 1 good Geneticist
THANKS in advance!!:)