Select an enemy model. The Activating model must attempt to enter BtB with the Enemy model by moving up to its Move Statistic in inches.
During this movement, it may only enter into the ZoC of the model with whom it is attempting to enter BtB.
However, while within that model’s ZoC or if the selected model is in the acting model’s ZoC it may ignore other Enemy models’ ZoC.

If at the end of its movement, it is in BtB with the selected Enemy model, it must resolve a Melee Exchange.
Models that start their activation in BtB with a single Enemy model may only move around that Enemy model’s base, ignoring the ZoC of enemy models.
They may enter BtB with a different chosen model as part of this move.

After moving a Melee Exchange is resolved with the chosen model in BtB.

Models that start their activation in BtB with a single Enemy model may only move around that Enemy model’s base, ignoring the ZoC of enemy models. They may enter BtB with a different selected model as part of this move. This movement is not limited by the model’s Move Statistic. After moving, a Melee Exchange is resolved with the selected model in BtB.

NOTE

You only remove one activation counter from a model for declaring a melee action and being involved in the resulting melee exchange.