Step on it, of course not to be a rapist! But here in Nanjing, gambling stones are very rare. After all, they are not the origin of wool. Some jade and jewelry companies are not involved in these gambling stones business.
But... But there are some big jewelry companies, also got some raw materials which are not very expensive, and opened a number of non-gambling stones, very informal gambling stones business.
The reason why Guan Yu chose to step on it is that he has no idea whether this technique can really detect whether there is jadeite in the raw wool stone or not. Whether it can be found out...