FYI, it is not cheap to buy from wholesaler prawns of that size. For 5 prawns about the size of 300-350 grams, it would costs about $38-$46 from wholesalers. It is possible that they served the size of 300-350 g to the angmo at $8 per 100g and it easily costs $200.
Did NEA finds out the price from wholesaler before they summarily suspend the hawker.
I am pretty sure it is a shoot first talk later.....or no talk later thing. My guess is that the poor hawker can't even defend himself in court.