dptdexys is correct.

If you choose to countercharge, you must move towards the closest enemy unit.  Since the Terminator is already in base contact, that's the closest.  The countercharge "must head towards the nearest enemy" (1.12.4) is not linked to ZoC like a charge move.  It's a flat requirement.  You can choose not to countercharge or to stop short but as long as you choose to move, you must move towards the closest enemy, regardless of ZoC.  Only if the closest enemy is fully engaged (base contact with 2 units, or 2 per DC) can it be bypassed for the next closest unit (from the FAQ).

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Neal

Hena:  Yes, that's my take on it.  While the "nearest enemy" is explicit in the countercharge rules, they otherwise operate like a charge move, so if you enter enemy ZoC, you have to attempt to reach base contact (though with countercharge distance of 5cm, that will fail unless you start in the ZoC).

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Neal

Does dismounting replace the infantry countercharge, or can the mounted infantry dismount and then countercharge (providing they obey coherency and direction etc)?

It is common practice for Orks to stay in their wagonz allowing them a 10cm countercharge and a 5cm dismount by the infantry, which seems to suggest that dismounting is in addition to the countercharge move. Does that also apply to the case where the transport is not making a move; so can the infantry make a 5cm dismount followed by a 5cm countercharge??

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Sir Hemry Newbolt

Infantry just get the dismount "move."  Regardless of whether they are embarking or disembarking or doing both, that is the only move they are allowed.  Everything else is dependent on the transport moving.

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Neal

Ok Thanks

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Sir Hemry Newbolt