Question: It’s my move, and I don’t have any possible Jumps. While Cantering one of my Knights, I’ve reached a square where it’s possible to Jump an enemy piece. Must I do so?

Answer: Yes. The Canter of your Knight has now become a Knight’s Charge, so you must make a capturing move, either immediately, or later in this move.

This is from the WCF rules. The implication seems clear, but I wonder if it could have been better explained. I am not quite clear on just why a charge suddenly becomes a mandatory move.