This simply allows you to interrupt multi charges.
Think of it this way. If your unit gets charged by 2 units in one charge phase, both will attack your unit before you can retaliate. Use the
CP ability and you get to retaliate before the second unit.
If your already in combat and get charged again by several more units, the same principles apply. But you have to let one charging unit attack you first before you interrupt.
unless your a howling banshee of course! Banshee masks
FTW!