Inflate the Sempertex 260 modelling balloon so that you have a 3 finger length un-inflated section at the end of the balloon.

The handle for the sword should be a 5 finger twist followed by a 6/8 finger bubble that is fold/loop
twisted into the twist for the handle.
More information on the fold/loop twist can be found here;
viewtopic.php?f=25&t=1091

Make another fold/loop twist the same size as your first one and twist this around the twist you made for the handle of the sword.

To finish make another 6/8 finger fold/loop twist and again twist into the handle of the sword.
Straighten the sword blade and wait for the children to start fighting