Source: Warhammer Armies Project: Unofficial 9th Edition

Direction of Pursuit (Multiple Combats)
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Once all flee moves have been resolved, resolve any pursue moves one at a time. In an order chosen by the controlling player, each pursuer pivots about its centre (ignoring other units) so that it is facing directly towards the centre of the fleeing unit of its choice, and then pursues, as described earlier. Note that this will sometimes lead to a pursuing unit 'catching up' with a fleeing unit that has rolled high enough to escape. In this case, the pursuing unit must stop 1" away.

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The red unit has lost the combat and failed its Break test. It has rolled high enough to escape, and make its flee move of 7".
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The blue player decides to move his smaller unit first. The unit pivots to face the fleeing red unit and starts its pursuit move of 6". Because of its position, this move would bring it back into contact with the red unit, so it has to stop 1" away.
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The larger blue unit then makes its pursuit move, but must stop 1" away from its comrades.

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