You can find grabbing and locking techniques very useful in a fight. The attacker grabs your hand, the collar of the shirt, hair, throat, or any part of your body, you can release yourself, then grab and lock the attacker.
Can you block a punch, then grab and lock the attacker's hand?
Before talking about this, you can watch this video. If you grab the attacker's hand and lock that as a defense of the punch, that's good. It seems easy to block, grab and lock the attacker's hand when he throws a punch.
You usually get that impression watching the video. In reality, it is difficult to do that. The attacker will not keep his hand there, after punching. As soon as the attacker punches you, he will get his hand back. You might not get the time to grab and lock the attacker's hand.
If for some reason the attacker does not pull his hand back after throwing a punch, you can grab the attacker's hand and apply this technique. Again you need to be very fast to do that. Otherwise, the attacker can punch you with his other hand.
You need to do that so fast that the attacker does not realize what you are up to. You can apply this technique when you see the attacker gets hurt or weak. Hope you found this useful.