This may be intended, and it may not...so it is time to play bug or feature. Using Charge you can attack the enemy, if you end in the square adjacent to the opponent. However, there are situations where I am already adjacent to a unit, and possess a charge card. When I use the card and change the facing appropriately, there is no attack. And please see this thread in regards to Penetrating attack cards. http://forums.cardhunter.com/threads/penetrating-attacks.2992/
Charge is a movement (blue) classed card and does damage equal to squares you move - so changing facing will not do damage. Feature, card isn't classed as an attack. Already replied to that other thread. Feature.