How about a reverse and tweaking of the shield support item. Either as a grenade or mine type. When used or deployed, depending on the type, it throws a shield around the target similar to the defensive one. The exception is that what is hit is trapped, as rounds and missles may pass in but not out. Let it last as long as an EMP pulse which seems to be fairly short lived. Grenade physics would be similar to the H.E. Grenade as far as distance and speed.
variant: target trapped but rounds can not enter or leave for say 5 seconds.
Edited by Warvain, July 14 2013 - 10:54 AM.