One example I've seen is the radio room scene from Where Eagle's Dare. The spy climbs a wooden stair to a new floor, sets a case down, walks down a hallway pst a T-intersection, and ito a radio room to stab the radio operator.
Potential stealth needs are arrival on the landing, passing by the intersection, and crossing the radio room. Some people would want rolls at those places to heighten tension during crossing those spaces even though there's only on target on the floor. The PC doesn't know that.