If the charging unit chooses to continue ahead, the outcome will depend upon the enemy unit:
If a charging unit makes accidental contact with a fleeing enemy unit, it will wheel to align as normal. The fleeing unit is considered to have been run down by the charging unit and is immediately removed from play. The charging unit's movement comes to an end and, due to the confused circumstances, cannot attempt to reform.
If a charging unit makes accidental contact with an enemy unit that is not fleeing, simply treat the charging unit as having redirected its charge into that unit.