How to defend against optimized charge?

[FMArthur]

There's also Cometary Collision, which is an awesomely-named feat that merely lets you ready an action to interrupt an enemy's charge at you or your allies at any point on the charge with your own charge. They can still complete their charge and can even change their target to you when you're done, so you better trip, grapple or kill them. Since charging is a full-round action, they can't even do anything else on their turn if you prevent them from finishing their charge this way, not even attack you from prone.