I guess you want to move the sprite by setting it's position to touch.x,touch.y and while moving have it face in the direction you are moving..
To do that you could give the sprite two instance variables oldX an OldY
is in touch-
sprite set value OldX : sprite.x
sprite set value OldY : sprite.y
sprite set position to : touch.x,touch.y
sprite set angle : angle(sprite.oldX,sprite.OldY,touch.x,touch.y)