disapation field modifies your quanta in order to work, sactuary prevents modification of your quanta. its an intended interaction.
Now i know how sanctuary nullifies a dis field if there both on the same side, but if you are using a sanctuary is it supposed to negate theres? Because thats what it seemed to do on a very unfortunate half blood.
Hmm...Was it only your weapon? Cause if so you're looking at this bug:http://elementscommunity.org/forum/index.php/topic,28104.0.html