The lesson I took from that is to use bare hand techniques and send the attacker sprawling, at which point you will have plenty of time to draw a weapon. Seemed to me like going for a weapon first is only the right choice if you are very far away. Bare hand techniques on someone who is really hyped up, probably not trained, and lunging on an attack should be relatively straightforward to redirect and make him trip. But I've only ever sparred, not done any takedowns in real life, so I may be badly mistaken. That video sure seems to back me up though.