Under what rule? Please cite a rule reference.Except in softball where a runner can be called out for being out of the baseline/base path even if they are running to 1B.
The only way I can think of them being called out without a fielder being involved is if they abandon the bases altogether (i.e. enter team area or leave live ball area (ASA 8-2D / 8-7U). Otherwise:
- Being out of their base path is only when they are avoiding a tag (ASA 8-7A).
- Being out of the 3-foot running lane to 1B is only when they interfere with a throw (ASA 8-2E).
They can be called out for interfering with a defender fielding a batted ball anywhere - even in their base path and the 3-foot running lane (ASA 8-2E-F / 8-7J).