[dynamite]

If you go night spot in Australia, suddenly a thin and short Vietnamese will snatch your hand phone and run. You and your group chase after him into a back alley. Then you see your group outnumbers 10:1. The one you chase after will then come out, take off his shirt and tell you fight one to one. But you can see if he get beaten up by you, their whole group will join in. 

This is their tactic. Both in Vietnam war and in Australia. Even Australian police get headaches. This is why they regretted taking them in as refugees.