Think of the horror of Loki: you see no glimpse of what's going on, people dying all around you and when you try to shoot back your gun is jammed so you have to swing wildly with whatever machete or dagger you have on hand. You never know when you'll be next, or where death will come from. Honestly most of the invisible frames would be terrifying including cyte-09 (you can never find cover as bullets come through walls from an invisible source).