Knight move, i mentioned 3 ways it could move, if you are trying to 'make a path', but of course, there is the way Charles said, being an action, a leap, and that is the way i see a knight move, and it could be that the creator of the game see's the knight moving like this also, therefore, the knight can only make a normal knight move, if legal.
I would be surprised if the knight could do a 'nightrider' type of move, though it is possible. especially seeing that it is not mentioned in the rules. If the square a knight could move to does not exist, why should that mean that it can continue on moving again like a knight, wouldn't that mean it has actually 'used' the non-existent square?
You would think that if the knight had such a move, or a special way to move, he would of mentioned this type of move. Seeing he did not talk about the knight, one could assume it only can play a normal knight move.