When is a runner considered "out of the baseline"?

A runner is considered "out of the baseline" when they deviate from the direct line between two bases to avoid a tag. This situation highlights the importance of maintaining a straight path between the bases. The baseline is not just a physical line but represents an established area of play that runners must adhere to during their journey around the bases. If a runner chooses to veer off this direct path merely to evade a defensive player attempting to make a tag, it is considered a breach of the baseline rules. Such action can result in the runner being tagged out because they have not followed the designated baseline.

In contrast, stopping unexpectedly or slipping does not constitute being out of the baseline, as these actions don't involve a conscious choice to change direction to avoid a tag. Similarly, running outside the field boundaries is not necessarily defined as being out of the baseline, since boundaries are a separate aspect of the field's playing area rather than the runner's movement between bases.