objective c - sprite image change with delay time in cocos2d -

am developing ipad game. want change 3 image delay time , when collision detection happens

am tryed tutorial changing animation , http://getsetgames.com/2010/04/18/how-to-animate-sprites-in-cocos2d/

but terminating app.

any other way there this?

there example of sprite animation in cocos2d examples (spritetest example - animated dragon).