Its pretty sloppy solution but what it does is detects another (known) paladins aura that is also providing it and will reduce the save down by that amount of the other pally's aura.
So without that line, both pally's auras will give +8 to saves, (one is +5, the other is +3), however, if someone has both auras on them with this extra coding, it will make it +5, +3, and -3 to saves. Thus still giving the benefit of the higher aura.
This is a really custom fix for it and you need to know ahead of time the bonus the lower pally's aura causes, and the name of the other pally's aura as a special coded name.

