Jack have buff-erasing skill and a heal, so I believe Cu Alter might lost because of that or he simply find it too troublesome to continue on.
OR, its because Jack is an insane star generating Quick based Servant, who also has a star boosting skill and can literally wreck anyone's shit with a 100% crit quick chain, on top of Culter being a berserker means he takes even more damage.
by herself she can wreck shit and do a continuous NP train non stop and remove all of your dodge,guts, buff while your at it, CU has no chance
What happened?Well... well...
I will have a thorough talk with Cu Alter and Jack later...We will need 3 months to repair this area...Who knows...Okay thenLet's play some more~Shut upsuch an unusual combination, but why do those two look so messed up?