The Targe shield just makes Demo too damage resiliant for Cave Johnsons. I've noticed ever since the last update to them they are just a pain in the ass to kill if you don't focus soley on them for a while. With overheal they can sustain more than 5 direct hits from cave. If anyone helps them by blocking hale from chasing them or a medic is in line of sight to crossbow they are impossible to kill. They just need a litte support to overcome the small amount of damage they take.
I dunno if the solution is to make the shield break after a certain number of lemons (say 3?) hitting directly or if they can be changed to be extra vunerable to fire since they already have an explosive reistance.
I spent half a round the other day attacking the same 3 demos over and over because they were taking turns body blocking my shots and then just getting a single medic crossbow to fully heal.