Camping Medic for a long period of time as a guard.
I have seen Guards do this sometimes, but I rarely see it so this post probably doesn't matter.
Example: Just imagine me shooting a guard in medic. I suck so I miss most shots but him 3 times and he downs me to 10 hp. he has an unfair advantage (my opinion) because he'll be able to heal easy and I wont (unless there are other places to heal). He kills me and is able to get 100 HP again if I hit him.
I think you see my point.
Give me shit or hate here.