When this character is chosen as the target of an attack, you may roll a d6. On a result of 5 or 6, the attacker can’t target this character with an attack this turn and the attacker may choose another target character instead. The attacker then makes the attack unless there are no targets, in which case the action resolves without an attack.

•(10-04-2012) (Example)
Black Adam wants to attack Morgan Le Fay, so he declares a close combat action and prepares to do a close combat attack.

Shape Change: As soon as Morgan Le Fay is picked as the target of the attack, Shape Change activates. If the Shape Change roll succeeds, Black Adam must pick a different target for his attack – if he cannot, the action ends without an attack. Keep in mind that since the attack has been declared, Black Adam cannot move to another square before making the attack – he needs to make the attack where he stands. Another thing to keep in mind is that Shape Change protects Morgan Le Fay from Black Adam for the rest of the turn – if Black Adam could use Flurry and Morgan Le Fay made a successful Shape Change against the first attack Black Adamwould not be able to target her with the second attack.

Read more: http://heroclix.com/heroclix/defense-defense-defense/#ixzz2AzXCrpqS

•Remember, you can only use Probability Control on your dice during your turn. So you can't use Probability Control to re-roll your Shape Change (since your Shape Change usually only kicks in on your opponent's turn).