It would be impossible to lose with a sword if they die in one hit... although there is a work around. Zombies can block sword with arms only body and leg hits will be accepted, zombies can not grab the sword though.
lol....
for sake of balancing
Humans = Long Range Restricted
Zombies = Short Range Restricted
Zombies MAY use foam swords if they do want, however socks will probably be not, since there shall be water balloons anyways