A defender has a foot inside the arc beneath the basket, and a replay shows a collision. That position matters, but it is not enough to decide every possible foul from a frozen frame. The no-charge semicircle rule applies to a particular situation.
FIBA’s Official Basketball Rules 2026, article 33.10, describe a drive in which the offensive player controls the ball while airborne and attempts a shot or pass, with a defender having one or both feet in contact with the semicircle area. In that defined situation, the contact is not called as a team-control foul unless the attacker illegally uses the hands, arms, legs or body.
Follow the sequence before the impact
Start the replay before takeoff. Identify the ball handler, the attempted shot or pass and the defender’s position. Then look at the contact itself. Focusing only on the defender’s shoe can hide an illegal arm movement or another relevant part of the play.
The arc does not give an attacker permission to push, swing an elbow or use the body illegally. Nor does it mean a defender can commit a foul merely because a charge is restricted in that location.
For an invented viewing exercise, compare an airborne drive with a separate collision between two players away from that drive. The same painted area may appear in the picture, but that does not make the two incidents the same rules question.
Check which rulebook the game uses
This explanation concerns the FIBA 2026 rule. NBA, school and other competitions may use different wording or interpretations. Identify the competition before borrowing a television commentator’s explanation from another league.
When discussing a disputed call, describe the observable sequence first: who controlled the ball, when the attacker became airborne, what action followed and where the defender was. Then connect those details to the applicable rule.
A useful replay discussion can end with uncertainty if the camera angle does not show a necessary fact. The painted arc helps frame the question; it does not answer every part of it.