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.

Titanzer said:

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