I prefer to use different methods to disable a "lighting speed" jab or cross.Thank you. I am sure you can do it too, it is not that hard. In all honesty its just prediction, you know they are going to jab, everyone jabs at the face. Just react at the right moment and you got it.
We train how to grab a jab and cross too. But the main purpose for our training is to enhance the ability for the "octopus strategy" that you have better chance to grab on your opponent's wrist when his arms are
- not moving, or
- moving in slow speed.