Personal shields

Hi all. I’m a little fuzzy on how a full personal shield differs from a partial personal shield. I’m not understanding why you would want a half shield at all. What’s the difference with regards to how one effect the combat mechanics as apposed from the other?

With a half-shield you are able to fire a laser if you have also one.
Also a half-shield cost less money and make more tensed gladiator fights.

in the duel, you’re moving your weapon asset on the map… and if you have a half shield, it, too, is on the map.

p.171:

A full shield asset cannot be moved. A half-shield asset can be moved in single combat, but only to zones adjacent to the wearer’s own zone.

Also, the text on 171 states also that shield users cannot use ranged weapons. It doesn’t specify either way on half-shields, but since it is all one paragraph…