You could put a time limit of some sort after which the hulk would disappear, and/or put a limit to the number of hulks in a given radius before they disappear, which would reduce the lag issues. We now have planes that continue to exist and fall out of the sky rather than exploding into a giant fireball when a pilot is killed, so I see this as being similar.
For an attacker, seeing three hulks ahead would be a good cue that there might be a defending camper right around that hedge . . .