Hello, and sorry to hear of your dilema, I am told that a lot of the chinese are envious of the foreign man as they are very rich (so i a to believe), it is also said if they like your bike they also watch you to see where you park it, s i park mine in the underground carpark if possible , or secure security gate where there is a visible security man, and also pay him a little extra to do so, much cheaper than losing the bike and having to replace everything, like fitted lock ,plates, alarm, and such.
Here is another question, an important one at that ( if anyone knows) If you overcome your assailent and beat him up because he drew a knife or other kind of weapon, and you win this fight , then what happens if the police are involved ? is it self defence if you beat the crap out of a would be theif, an interesting thought