If R3 is on third and F1 feints toward third without stepping, what is the ruling?

When a pitcher (F1) feints toward third base while on the mound, he must establish a genuine attempt to pick off a runner. If F1 feints without making a legitimate motion towards a base or stepping towards that base, this is considered a balk. A balk occurs when the pitcher makes an illegal motion with the intent to deceive the base runners, which can disrupt normal gameplay and advantage the offense.

In this scenario, because F1 feints towards third without stepping, he is not making a legal play. The rules dictate that pitchers must adhere to a specific set of actions when attempting to throw to a base or making a motion perceived as a pick-off attempt. Therefore, under standard baseball rules, this action by F1 results in a balk being called, allowing any base runners to advance. Other options like 'legal action,' 'no action required,' or 'it's a warning' do not cover the specific violation represented by F1's actions.